Scelta multipla
Which of the following statements about crossing over during meiosis I is correct?
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9. Mitosis and Meiosis
Meiosis
Scelta multipla
At the end of anaphase I of meiosis I, which of the following best describes the state of homologous chromosomes?
A
Homologous chromosomes are still paired at the metaphase plate.
B
Homologous chromosomes have separated and are moving toward opposite poles.
C
Sister chromatids have separated and are moving toward opposite poles.
D
Each chromosome consists of a single chromatid.
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Recall the key events of meiosis I, especially focusing on anaphase I, where homologous chromosomes are separated.
Understand that during metaphase I, homologous chromosomes (each consisting of two sister chromatids) align at the metaphase plate as pairs.
During anaphase I, the homologous chromosomes are pulled apart toward opposite poles, but sister chromatids remain attached.
Recognize that sister chromatids do not separate until anaphase II of meiosis II, so at the end of anaphase I, each chromosome still consists of two chromatids.
Conclude that the correct description is that homologous chromosomes have separated and are moving toward opposite poles, while sister chromatids remain together.
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