Multiple Choice
Which of the following is a unique event that occurs in meiosis I (and not in meiosis II)?
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9. Mitosis and Meiosis
Meiosis
Multiple Choice
During which phase of meiosis is the chromosome number reduced from diploid () to haploid ()?
A
Anaphase I
B
Anaphase II
C
Prophase I
D
Metaphase I
Verified step by step guidance1
Recall that meiosis consists of two successive divisions: meiosis I and meiosis II. The chromosome number reduction occurs during meiosis I.
Understand that in meiosis I, homologous chromosomes (each consisting of two sister chromatids) pair up and then separate, reducing the chromosome number from diploid (2n) to haploid (n).
Identify the specific phase in meiosis I when homologous chromosomes are pulled apart to opposite poles of the cell. This phase is called Anaphase I.
Note that Anaphase II involves the separation of sister chromatids, but the chromosome number remains haploid (n) because the reduction already occurred in meiosis I.
Therefore, the chromosome number is reduced from diploid to haploid during Anaphase I, not during Prophase I or Metaphase I, which are earlier stages of meiosis I.
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