LABORATORY REVIEW
MITOSIS AND MEIOSIS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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The sister chromatids separate during meiosis 1, but not during meiosis 2
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The homologous chromosomes pair up during meiosis 2, but not during meiosis 1.
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Four haploid sex cells are produced as a result of meiosis 2, but not during meiosis 1.
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Chromosomes number decreases by half as a result of meiosis 2, but not as a result of meiosis 1.
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Detailed explanation-1: -In meiosis I, homologous chromosomes separate, while in meiosis II, sister chromatids separate. Meiosis II produces 4 haploid daughter cells, whereas meiosis I produces 2 diploid daughter cells. Genetic recombination (crossing over) only occurs in meiosis I.
Detailed explanation-2: -There are two divisions in meiosis; the first division is meiosis I: the number of cells is doubled but the number of chromosomes is not. This results in 1/2 as many chromosomes per cell. The second division is meiosis II: this division is like mitosis; the number of chromosomes does not get reduced.
Detailed explanation-3: -Mitosis results in two identical daughter cells, whereas meiosis results in four sex cells.
Detailed explanation-4: -Meiosis I is a type of cell division unique to germ cells, while meiosis II is similar to mitosis. Meiosis I, the first meiotic division, begins with prophase I. During prophase I, the complex of DNA and protein known as chromatin condenses to form chromosomes.