Identify the meiotic stage in which the homologous chromosomes separate while the sister chromatids remain associated at their centromeres:
Correct answer: C. Anaphase I
- A. Metaphase I
- B. Metaphase II
- C. Anaphase I
- D. Anaphase II
Explanation
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 homologue migrate to the opposite pole. Thus, 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. Thus the paternal and maternal chromosomes of each homologous pair segregate during anaphase I independently of the other chromosomes.
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