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Question

During anaphase I of meiosis,


A
Homologous chromosomes separate
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B
Non-homologous chromosomes separate
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C
Sister chromatide chromosomes separate
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D
Non-sister chromatids chromosomes separate
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Solution

The correct option is A Homologous chromosomes separate
During anaphase I, from each tetrad, two chromatids of a chromosome move as a unit (dyad) to one pole of a spindle, and the remaining two chromatids of its homologus migrate to the opposite pole. Thus, the homologous chromosomes of each pair, rather than the chromatids of a chromosome, are separated. As a result, half of the chromosomes, which appear in early prophase, go to each pole. It is here in the anaphase I that the real reduction in the number of chromosomes occurs.
So, the correct answer is 'Homologous chromosomes separate'.

Biology

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