Heredity questions, high school biology, typical examples
The following are some typical examples of high school biology genetics questions: ** 1. Type of genetic pedigree ** 1. ** Exemplary Question ** - It was known that there were two hereditary diseases in a family, A and B, one of which was red-green color blindness. In the pedigree, II- 4 and II- 5 were normal, and she gave birth to a girl with nail disease III- 6. - Question: - (1) To determine the mode of inheritance of A and B diseases. - (2) What is the probability of II- 4 being a carrier of A disease? What was the probability of being a carrier of B disease? - (3) If II- 4 and II- 5 had another child, what was the probability of it being a normal girl? - Answer: - (1) From the fact that II- 4 and II- 5 were normal and gave birth to a girl with A disease III- 6, it can be seen that A disease is an autosomal-dominant hereditary disease, so B disease is red-green color blindness, which is a hereditary disease with X. - (2) For disease A (genes A, a), II- 4 is a heterospore (Aa); for disease B (genes B, b), the probability of II- 4 being a carrier (XBXb) is 1/2. - (3) II- 4 had AaXBXb, AaXBXB, and II- 5 had AaXDY. The probability of them giving birth to a normal girl was 3/8. 2. ** Consolidating Practice Type ** - In the investigation of human genetic diseases, it was found that both families had patients with A genetic disease (genes H, h) and B genetic disease (genes T, t). It was known that I- 3 had no B virus gene. - Question: - (1) What is the inheritance method of nail disease? - (2) If I- 3 has no B virus gene, please continue to analyze: - (1) What was the I- 2 gene type? What was the II- 5 gene type? - (2) If II- 5 and II- 6 were married, what was the probability of the boy born to have both genetic diseases? - (3) If II- 7 and II- 8 gave birth to another daughter, what was the probability of the daughter suffering from nail disease? - If II- 5 marries an h gene carrier and gives birth to a normal son, what is the probability of the son carrying the h gene? - Answer: - (1) According to the meaning of the question, I- 1 and I- 2 did not have nail disease, but they had a daughter (II- 2) who had nail disease, so nail disease was an autosomal-recessive hereditary disease. - （2） - (1) Because B disease is a X-linked inherited disease, the I- 2 gene type is HhXTXt, and the II- 5 gene type and probability are HHXTY or HhXTY. - (2) The probability of the II- 6 gene type being Hh is 2/3, and the probability of being XTXt is 1/2. Therefore, if II- 5 and II- 6 get married, the probability of the boy born with A disease is 2/3×1/4 = 1/6, and the probability of B disease is 1/2×1/2 = 1/4. Therefore, the probability of both genetic diseases at the same time is 1/6×1/4 = 1/24. - (3) The probability of II- 7 being Hh is 2/3, and the probability of II- 8 being Hh is 10 - 4, so the probability of them having a daughter with nail disease is 2/3×10 - 4×1/4 = 1/6×10 - 4. - (4) The probability of II- 5 being HH (1/3) and HH (2/3). If a person marries a carrier of the h gene (HH) and gives birth to a son with a normal expression, the probability of the son carrying the h gene is 3/5. Read more exciting novels for free
High School Biology Heredity and Evolution
The thought map of the second compulsory subject of high school biology,"Heredity and Evolution", mainly covered the following points: - ** The discovery of genetic factors **: - The reasons for the success of Mendel's pea crossbreeding experiment included the correct selection of experimental materials (pea self-pollinating, closed pollinating, easily distinguishable relative traits, etc.), the study of relative traits from one pair to many pairs, the analysis of experimental results, the use of hypothesis-deduction method, etc. - The related concepts included relative traits, trait separation, dominant and latent traits, allelic genes, dominant and latent genes, homo and heterozygy, and the combination of genetics and environment to form a trait. - Concepts such as crossing, self-crossing, and test-crossing (F1 hybrids with a recessive-type hybrid can test the F1 gene type). - ** Relationship between genes and genetics **: - Meiosis is related, including the concept of Meiosis (the division in which the number of hormones is halved when mature reproductive cells are produced, and the cell splits twice with each copy of the fetus). - The first division of the Meiosis Division (such as the characteristics of various stages such as the sperm cell in the seminidium, the interphase replication of the sperm, and the syndesis of the prophase) and the second division of the Meiosis Division (such as the characteristics of various stages such as the disorderly arrangement of the prophase). - ** Nature of Genes **:(The relevant content is not described in detail in the materials. It can be further supplemented according to the contents of the teaching materials, such as the exploration of DNA as the main hereditary material, etc.) - ** Gene expression **:(The relevant content is not described in detail in the materials. It can be further supplemented according to the content of the teaching materials, such as the process of transcribing and translation.) - ** Gene mutation and other mutations **:(The relevant content is not described in detail in the materials. It can be further supplemented according to the teaching materials, such as the concept, type, and significance of gene mutation, and other types of mutations such as aberrations, etc.) - ** From crossbreeding to genetic engineering **:(The relevant content is not described in detail in the materials. It can be further supplemented according to the content of the textbook, such as the principle, process, advantages and disadvantages of crossbreeding, and the operation tools and steps of genetic engineering, etc.) - ** Modern Biological Evolution Theory **:(The relevant content is not detailed in the materials. It can be further supplemented according to the teaching materials, such as the change of population gene frequency and biological evolution, isolation and speciation, etc.) <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
Junior high school biology paper typical problem analysis questions and answers
The following are some typical questions and answers for junior high school biology papers: * * 1. Single choice question ** 1. * * The meaning of the body of the hydra being symmetrical ** - Answer: D (both). - [Analysis: Hydra's symmetrical body shape allows it to sense stimulation from all directions, capture prey from all directions, and defend against enemies from all directions.] This symmetrical way was compatible with its aquatic, fixed, or floating lifestyle. 2. * * Judgment on the difference between high and low animal groups ** - [Question: There are many animal groups, and there are high and low grades. The following statements are incorrect ()] - Answer: B. - [Analysis: Although the body of a thread-shaped animal is cylindrical, it cannot be determined that it is higher than a flat-shaped animal.] The bilateriality of flat-shaped animals was higher than that of coelenterate because the bilateriality made the body of animals have the division of front, back, left, right, back and abdomen, which was conducive to directional movement. Reptiles could fully adapt to land life, which was higher than amphibians. Mammals were better than birds in reproductive development because they were born and suckled. 3. * * The similarities between roundworms and pork taenias in adapting to parasitic life ** - Answer: B. - Analysis: Ascaris lumbricus and pork taeniasis are parasites. The similarity between them and parasitic life is that they have developed reproductive organs, which is conducive to their reproduction in the host's body. They did not need developed digestive organs because they could obtain nutrients from their hosts. The roundworm had a stratum corneum on its body surface, but the pork taeniasis did not. Symmetries on both sides of the body were not unique to their parasitic life. 4. * * The relationship between the cell structure of roundworms and their living environment ** - Question: The roundworm lives in the human digestive tract and does not get oxygen for a long time, so which structure in its cells may disappear () - Answer: C. - "Analysis: The mitochondria is the main place for oxygen breathing. The roundworm lives in an anoxia-deficient environment and carries out anoxia-free breathing, so the mitochondria may degenerate and disappear. The cell membrane was the boundary structure of the cell, the nucleus was the control center of the cell, and the plasma was the main place for the cell to carry out metabolism. They would not disappear due to lack of oxygen. 5. * * Muscle movement when the locust jumps ** - [Question: When the locust jumps, its hind feet change from bending to stretching. The following related statements are wrong ()] - Answer: B. - [Analysis: When the locust jumps, muscle A relaxes and muscle B contracts, causing the hind feet to turn from a bent state to an extended state.] The inner muscles of the hind feet were attached to the inner side of the exoskeleton. The locust's chest had three pairs of feet, and the body and feet were divided into sections. The muscles provided power for the locust's jumping. 6. * * Common characteristics of mussels, snails and cuttlefish ** - Answer: C. - [Analysis: Mussels, snails, and cuttlefish all have a common feature: they all have a mantle.] Mussels had shells, snails had shells, and cuttlefish's shells had degenerated. Snails moved with their stomachs, mussels moved with their axes, cuttlefish moved with their wrists and used them to hunt for food, and mussels breathed with their gills and relied on water pipes and water pipes to obtain food. 7. * * The relationship between animal groups and their characteristics and the map (The map is not shown, so the specific options cannot be analyzed in detail, but the idea is as follows)** - Answer: It depends on the specific choice. - "Analysis: Based on the characteristics of various animals, such as the characteristics of coelenterate, flat-shaped animals, and thread-shaped animals, the animal groups described in the options and their characteristics should be compared to the actual situation, including the characteristics of body structure, lifestyle, physiological functions, and so on. 8. * * Description and judgment of animal structure and function ** - Question: The structure of an animal is always compatible with its function. - Answer: B. - [Analysis: The lizard's body is covered with horny scales, which can prevent the water in its body from evaporating. Lizards use their lungs to breathe. Their skin is dry and does not assist in breathing.] The roundworm's body surface was wrapped in a cuticle for protection; the locust's body surface had a tough exoskeleton that could prevent the water in the body from evaporating; the fish's body surface was covered with scales, and the surface of the scales had slippery mucus to protect the body. 9. * * Escape (Chameleon)'s characteristic description and judgment ** - [Question: Which of the following descriptions about avoiding servitude is correct?] - Answer: B. - Analysis: The body color of the evildoer can change with the environment, which is a protective color; the evildoer has developed lungs and strong gas exchange ability, which is conducive to its breathing in land life; the reproductive development of the evildoer completely gets rid of the dependence on the water environment; the fertilized egg of the evildoer does not need to absorb water and oxygen from the outside world when hatching. 10. * * Description and judgment of animal structure and living environment ** - Question: The following statements about animals adapting to their living environment are incorrect () - Answer: B. - "Analysis: Male frogs have a vocal sac. The vocal sac is the vocal organ of male frogs. It has nothing to do with adapting to life in water or on land. It mainly attracts female frogs during the breeding season. Fish used gills to breathe to adapt to life in the water, pigeons 'forelimbs turned into wings to adapt to flying life, and lizards had horny scales to adapt to life on land. 11. * * The corresponding judgment of animals and their gas exchange sites ** - Answer: C. - Analysis: Paramecium carries out gas exchange through the membrane; earthworms carry out gas exchange through the body wall; snails carry out gas exchange through the mantle; river mussels carry out gas exchange through gills; locusts carry out gas exchange through the trachea, not the lungs; seahorses carry out gas exchange through gills; frogs carry out gas exchange through the lungs and skin; pigeons carry out gas exchange through the lungs, and the air sacs assist in breathing but do not carry out gas exchange. 12. * * Judgment of the relationship between the characteristics of different creatures (The specific circle map of the creatures represented by P, Q, E, and F is not given. It is impossible to analyze the specific choices in detail, but the idea is as follows)** - Answer: It depends on the specific choice. - "Analysis: Based on the characteristics of the organisms involved, such as the way of reproduction of mammoths, the way of reproduction of many animals, the way of obtaining nutrition by heterotrophy, and the characteristics of land animals that can prevent water loss and adapt to land life, the accuracy of the contents of P, Q, E, and F in each option should be judged. 13. * * Gas exchange of birds in flight ** - Question: The following descriptions of birds and mammals are wrong: - Answer: A. - [Analysis: When birds fly, only the lungs can exchange gases. The air sacs play a role in assisting breathing and cannot exchange gases.] Birds 'bones were light, thin, and strong, and their chest muscles were well-developed. * * 2. Non-multiple choice questions (Since the specific content of the questions is not given, the following is an analysis of common test points)** 1. * * Cell structure is related to function ** - For example, if one were to examine the structure of a cell, one might ask about the functions of the cell's structure, such as the plasma, nucleus, and cell membrane. - Answer: The cell membrane has the function of controlling the entry and exit of substances into the cell; the nucleus is the control center of the cell and contains genetic material; the plasma is the main place for the cell to carry out metabolism, and the organelle, such as the mitochondria, is the main place for oxygen breathing (the plastids in plant cells are the places for photosynthesis, etc.). 2. * * The classification basis and characteristics of animals and plants ** - For example, comparing the difference between a vertebra and an insect. - Answer: Vertebrate animals have a spine made of vertebrae, but there is no spine in the body of an animal with no backbone. Vertebrate animals included fish, amphibians, reptiles, birds, and mammals, each of which had different characteristics, such as fish breathing with gills and swimming with fins; young amphibians breathing with gills, adults breathing with lungs and skin, etc.; Invertebrae included coelenterate, platyphores, threadworms, annelids, mollusks, arthropods, etc. The body of coelenterate was symmetrical, with a mouth but no anus; the body of platyphores was symmetrical on both sides, with a mouth but no anus, etc. 3. * * The relationship between living things and the environment ** - For example, how the structure of an animal adapted to its living environment. - Answer: For example, animals in the desert, camels have humps to store fat, wide soles to prevent sinking, long eyelashes to prevent sand and wind, etc. Fish that live in the water have streamlined bodies to reduce resistance, and they use gills to breathe to obtain oxygen in the water. 4. * * Biological reproduction and development ** - For example, comparing the reproductive and development characteristics of insects, amphibians, birds, and mammals. - Answer: Insects are egg-laying and have metamorphosis (complete metamorphosis is like butterflies going through four stages of egg, larva, pupa and adult, and incomplete metamorphosis is like locusts going through three stages of egg, larva and adult); frogs are egg-laying, in addition to external fertilisation and metamorphosis; birds are egg-laying, internal fertilisation, hatching and brooding; mammals are live-laying, breast-feeding, and internal fertilisation. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
High School Biology Questions: Clone Cows
Biology practice questions recommended by high school
The following are some high school biology practice questions: 1. High School Biology Problem Solvers, which covered many questions related to the material basis of life, biology, and the environment. 2. High school biology "1000 Paths" basic knowledge fill-in-the-blanks questions were helpful in consolidating basic knowledge. 3. High School Biology Practice Questions (with answers). The high school biology knowledge points were scattered. This practice question could be practiced with the knowledge points. 4. It was a mock test paper from the "Gold Medal Olympiad Solution and Practice: High School Biology." 5. There was also information specifically for the 100 questions in high school biology. It could avoid blindly brushing the questions. Through the study of these questions, one could identify the easily confused knowledge points in biology. 6. The biology college entrance examination's real questions and the test center's classification of special practice questions were helpful for special training. They could accurately brush the questions and improve the accuracy and speed of solving the questions. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
20 junior high school experimental questions in biology
The following are 20 junior high biology experiment questions: ** 1. Experimental questions on the nervous system and the effects of alcohol ** 1. Drinking alcohol would damage a person's nervous system. Drinking too much alcohol would poison the cerebrum and cause instability in walking. It would also poison the language center and visual center of the cerebral hemisphere. In serious cases, the entire nerve center would be poisoned. Please explain why these phenomena occur when drinking too much, and how this is related to the function of the cerebrum to maintain body balance? 2. An experiment was conducted to investigate the effects of alcohol on the driver. It was discovered that the driver's hand and foot movements lost coordination and accuracy. The reason was analyzed from the perspective of the nervous system being affected by alcohol. 3. Design an experiment to explore the effects of different levels of alcohol on the nervous system's reaction speed. Write down the experimental steps, variable settings, and expected results. ** 2. Experiment questions related to visual formation ** 1. In the process of forming vision, which structures do light rays pass through in order to form an image on the retina? He also drew a simple light path map. 2. If the order of light entering the eyeball was: 1 corneas → 4 pupils → 2 crystalline lens → glassy body → 3 retina, how would vision be affected when a certain structure was damaged? Give an example. 3. How to set up a control experiment in an experiment to explore the relationship between the formation of vision and the intensity of light? ** 3. Microorganism fermentation experiment questions ** 1. In the wine-making process, yeast was used to break down glucose to produce alcohol and carbon dioxide under an anoxide-free condition. Please design an experiment to prove that yeast fermentation requires an anoxide-free environment, including experimental materials, steps, and observation indicators. 2. In the process of producing fuel alcohol from corn stalks, yeast was needed from the sugar liquid to the alcohol stage. If he wanted to increase alcohol production, how could he improve the conditions for yeast fermentation? Propose hypothesis and design experiments to verify it. 3. Comparing the similarities and differences between yeast fermentation and yogurt fermentation in terms of products, fermentation conditions, and effects on food production. ** 4. Experiment on the influence of alcohol on the heart rate of water fleas ** 1. An interest group was investigating the effect of alcohol concentration on the heart rate of water fleas. How should water fleas be selected in the experiment? 2. In this experiment, other than the variable of alcohol concentration, what other factors needed to be consistent? Why? 3. According to the experimental results (when the fraction of alcohol was 5%, 10%, 15%, and 20%, the corresponding heart rate of the Daphnia was 24, 21, 17, and 0 (death)), a line chart of the relationship between alcohol concentration and the heart rate of the Daphnia was drawn, and the reason for the change of the curve was analyzed. ** 5. Other experiment questions ** 1. What was the purpose of each step in the experiment of making and observing the temporary mounting of the onion's inner skin cells? For example, the effect of dripping water and solution of iodines. 2. In an experiment to explore the conditions needed for seed sprouting (such as moisture, air, temperature, etc.), how to set up multiple groups of control experiments? 3. How to remove and control the variable of carbon dioxide in the experiment to explore the carbon dioxide required for plant photosynthesis? 4. Design an experiment to investigate whether animals have learning behavior, choose the right animals, and write the experiment plan. 5. In the experiment of observing earthworms, what were the characteristics of the body structure of earthworms that were suitable for their living environment? 6. In the experiment to explore the difference between the composition of exhaled and inhaled gas, how to collect and detect gas? 7. A certain student wanted to investigate the effect of hormone on the development of tadpoles. How could he control the variables in the experiment? 8. In the experiment to explore the effect of acid rain on the sprouting of plant seeds, how to simulate acid rain? 9. Design an experiment to explore the effect of different light intensity on the intensity of plant photosynthesis. Write down the experimental materials, steps, and expected results. 10. In experiments to explore the nutritional components of food (such as starch, protein, fat, etc.), how could they be tested? <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
How difficult are the biology questions in senior high school?
In 2024, the biology questions of the college entrance examination in Shandong Province were more difficult. The genetic questions were especially difficult. There were two genes and three traits, including the situation of the gel eletrophoretic map. Moreover, the score increased, and the proportion of the details increased. The overall difficulty was high. The questions were not only abstract and difficult to understand, but they also required a lot of reading. The questions were novel and were quite different from the questions he usually practiced. Judging from the reactions of the examinees, many of them felt great pressure. Even if they invested a lot of time and energy in preparing for the exam, they were still unable to do so during the exam. In terms of multiple-choice questions, some examinees reflected that the first question was very difficult. They even felt that the multiple-choice questions were more difficult than the big questions. From the feedback of the invigilators, some of the examinees in the examination hall were completely wiped out by the last question of the genetic question. No one finished the biology paper. However, the calculation of biology questions was not difficult. As long as he paid attention to the summary of the solution routines of various types of questions, he would be able to deal with them easily. But overall, the difficulty of the biology questions in the 2024 Shandong college entrance examination was a great challenge for the examinees. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
Junior high school biology questions must be memorized
The following are some of the must-memorize content that might be involved in the junior high school biology questions: - In terms of biological structure, cells were the basic units of biological structure and function. The structure of an animal was cell → tissue → organ → system → animal, while the structure of a plant was cell → tissue → organ → plant. - Biological and environmental parts: The composition of the ecosystem includes biological parts (producers, consumers, decomposing) and non-biological parts (sunlight, air, water, etc.). The substances and energy in the ecosystem flow along the food chain and food web, and the energy transfer is one-way and diminishing. - Green plants in the biosphere: the reaction formula, essence (synthesizing organic matter, storing energy), significance (providing food and oxygen for themselves and other organisms); the reaction formula, essence (decomposing organic matter, releasing energy) of the respiratory process and its importance in plant life activities. - Human Physiology: The nutrients of the human body (such as sugar, fat, protein, vitamins, water, and mineral salt); the composition of the digestive system and the functions of various organs; the digestion and absorption process of food; the composition of the respiratory system and the gas exchange process.(including the gas exchange in the lungs and tissues); the composition of the blood circulation system (heart structure, blood vessel type and function, blood composition and function); the blood circulation pathway (body circulation and lung circulation); the composition of the urine system and the process of urine formation (glomerular filtering and glomerular reabsorption). - Biological inheritance and variation: genes control biological traits, the law of gene transmission between parents and offspring (such as trait separation ratio), concepts such as relative traits, dominant genes, latent genes, dominant traits, latent traits, etc.; types of biological variation (heritable variation and non-heritable variation) and their reasons. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
High school biology questions and analysis of solving skills
Junior high school biology research questions and answers
Here are some questions and answers that might be involved in junior high school biology research: ** 1. Regarding nutrition ** 1. [Question: How do common meat dishes affect the development of brain intelligence?] - Answer: Different meat dishes contained different nutrients. For example, fish was rich in fatty acid, which was beneficial to the development and maintenance of brain cells and had a positive impact on the development of brain intelligence. Meat was rich in protein, iron, and other nutrients. The protein was the basic material that constituted the brain cells, and iron was an important raw material for the synthesis of hemoglobin. It ensured the oxygen supply of the brain and indirectly played a role in the development of the brain's intelligence. However, excessive consumption of meat dishes could lead to problems such as excessive fat intake, affecting health and possibly affecting brain function. 2. [Question: What is the relationship between nutrition and health for middle school students?] - ** Answer **: Middle school students are in a critical period of growth and development and need adequate nutrition. A reasonable intake of nutrients, such as sufficient calories to provide energy, protein to build body tissues, vitamins and minerals to maintain physiological functions, could ensure the normal development of the body, improve immunity, and enhance learning ability. If the nutrition is not balanced, there may be health problems such as leukemia (lack of iron, etc.), growth delay (lack of protein, etc.), and vision loss (lack of vitamins A, etc.). ** 2. About the environment and biology ** 1. [Question: How do common plants react to environmental changes?] - [Answer: Some plants are more sensitive to environmental changes.] For example, when the temperature rises, the growth cycle of some plants may be shortened, and the flowering and fruiting of some plants may be accelerated. In dry environments, plants will reduce water loss by closing their stomata, and their roots will grow deeper to find water. In terms of countermeasures, the environment could be improved by planting plants with strong adaptability to the environment. For example, plants that could absorb harmful gases could be planted in heavily polluted areas, and plants with developed roots could be planted in areas prone to soil erosion. 2. [Question: What are the effects of air pollution on crops?] - ** Answer **: Sulfur dioxide, nitrogen dioxide, and other gases in the air pollution may damage the leaf tissues of crops and affect photosynthesis. For example, after sulfur dioxide enters the leaves of plants, it will form sulfurous acid, destroy the photosynthesis, cause the leaves to lose their green color and turn yellow, and in serious cases, cause the leaves to die. In addition, air pollution could also affect the growth and development of crops, resulting in lower yield and quality. ** 3. Regarding physiological structure and function ** 1. [Question: Which layers of cells does oxygen pass through when it enters the blood?] - ** Answer **: It passed through the two layers of cells in the walls of the lungs and capillaries. 2. [Question: Which component in the blood will decrease after gas exchange?] - ** Answer **: Less carbon dioxide. 3. [Question: What kind of blood does the blood that flows through the capillaries around the lung become?] - [Answer: Arterial blood.] 4. [Question: Which substance does oxygen combine with after entering the blood?] - ** Answer **: Binding with hemogloblin. 5. [Question: What are the two parts of a gene?] - ** Answer **: It consists of two parts, DNA and protein. 6. [Question: What is the structure of DNA?] - ** Answer **: DNA has a double spiral structure. 7. [Question: How many genes are there in a strand of DNA?] - ** Answer **: There are many genes. 8. [Question: What does the gene control?] - ** Answer **: Genes control the traits of living things, but the traits of living things are also affected by the environment. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>