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Which of the following is separated during meiosis I and meiosis II respectively?
Chromosomes, chromatids
Chromosome only
Chromatids only
Chromatids, chromosomes
Answers (1)
Meiosis I is also known as the reduction division because it causes the number of chromosomes to change from diploid to haploid by separating homologous chromosomes. During meiosis II, sister chromatids are divided, creating four genetically distinct haploid daughter cells. Hence option 1 is correct.
Choice (2) Chromosome alone is wrong since sister chromatids separate from each other during meiosis II, whereas homologous chromosomes come together and separate from each other during meiosis I. As a result, rather than merely chromosomes, sister chromatids also play a role in the meiotic process.
Choice (3) The statement "chromatids only" is untrue since homologous chromosomes come together and separate from one another during meiosis I, which also involves the separation of chromatids. However, the sister chromatids split apart during meiosis II. Therefore, not just chromatids but also homologous chromosomes participate in the meiotic process.
Choice (4) Chromatids, chromosomes is inaccurate since meiosis I involves the coming together and splitting apart of homologous chromosomes, not merely the separation of chromatids. Sister chromatids, which entail the separation of chromatids rather than complete chromosomes, separate from one another during meiosis II. Therefore, meiosis involves both whole chromosomes and chromatids, but they are divided at various times. Sister chromatids are split during meiosis II, while homologous chromosomes are split during meiosis I.
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