第 1 题
1 分Which statement correctly defines clones in the context of reproduction?
Oxford AQA IGCSE · CORE Biology (9221)
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第 2 题
1 分In asexual reproduction, an individual is produced that is genetically identical to its parent. Which of the following statements explains why genetic variation is absent in this process?
第 3 题
1 分Consider the processes of cell division in multicellular organisms. If a body cell divides by mitosis and a cell in a reproductive organ divides by meiosis, what is the key difference in the outcome for the resulting cells?
第 4 题
1 分Which statement accurately describes asexual reproduction?
第 5 题
1 分According to the OxfordAQA syllabus, why does sexual reproduction lead to genetic variety in the offspring, whereas asexual reproduction does not?
第 6 题
2 分What term is used to describe the genetically identical individuals that are produced as a result of asexual reproduction?
先自己写一遍答案，再对照解题步骤。
第 7 题
4 分Describe the specific role of gametes in sexual reproduction and explain how their fusion contributes to genetic variety in the resulting offspring.
先自己写一遍答案，再对照解题步骤。
第 8 题
5 分Explain why the offspring produced from asexual reproduction are referred to as clones, and identify the primary biological reason for the total absence of genetic variation in this process.
先自己写一遍答案，再对照解题步骤。
第 9 题
4 分There are two main forms of reproduction in living organisms, each resulting in different outcomes for the offspring.
a) Name the form of reproduction that results in clones.
b) Explain why sexual reproduction leads to genetic variety in the offspring, whereas asexual reproduction does not. In your answer, refer to the role of gametes and the mixing of genetic information.
先自己写一遍答案，再对照解题步骤。
第 10 题
7 分Reproduction ensures the continuation of a species and can occur through different cellular processes.
a) Compare the process of mitosis and meiosis in terms of the number of divisions and the genetic relationship between the parent cell and the resulting daughter cells.
b) Explain why sexual reproduction results in variety in the offspring while asexual reproduction results in clones.
c) In terms of chromosomes, explain what happens during fertilisation to ensure the embryo has the correct number of chromosomes in its body cells.
先自己写一遍答案，再对照解题步骤。
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