Multiple Choice
During meiosis, at which phase is it preferable to obtain chromosomes to prepare a karyotype?
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9. Mitosis and Meiosis
Meiosis
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During meiosis, at which stage does the number of chromosomes in a cell become reduced by half?
A
Anaphase I
B
Prophase I
C
Telophase II
D
Metaphase II
Verified step by step guidance1
Recall that meiosis consists of two successive divisions: meiosis I and meiosis II, each with distinct stages (prophase, metaphase, anaphase, telophase).
Understand that the reduction in chromosome number occurs during meiosis I, where homologous chromosomes are separated, unlike meiosis II where sister chromatids separate.
Identify that during Anaphase I, homologous chromosomes are pulled to opposite poles, effectively halving the chromosome number in each daughter cell.
Note that Prophase I is when homologous chromosomes pair and crossing over occurs, but chromosome number is not yet reduced.
Recognize that Metaphase II and Telophase II occur in meiosis II, where sister chromatids separate, but the chromosome number has already been halved in meiosis I.
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