Multiple Choice
Which event occurs during the Metaphase I phase of Meiosis I?
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12. Meiosis
Introduction to Meiosis
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Which event during meiosis leads to a reduction in chromosome number from 2n to n?
A
Separation of homologous chromosomes during anaphase I
B
Separation of sister chromatids during anaphase II
C
Crossing over during prophase I
D
Formation of the synaptonemal complex
Verified step by step guidance1
Understand that meiosis is a type of cell division that reduces the chromosome number by half, resulting in four haploid cells from one diploid cell.
Recall that meiosis consists of two stages: Meiosis I and Meiosis II. Each stage has its own phases: prophase, metaphase, anaphase, and telophase.
Focus on Meiosis I, where homologous chromosomes (each consisting of two sister chromatids) pair up and then separate. This is the key event that reduces the chromosome number from diploid (2n) to haploid (n).
During Anaphase I of Meiosis I, homologous chromosomes are pulled apart to opposite poles of the cell. This separation is crucial for reducing the chromosome number.
Recognize that the separation of sister chromatids occurs in Anaphase II of Meiosis II, which does not change the chromosome number from 2n to n, but rather separates the chromatids of each chromosome.
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