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For how long does cohesin keep a pair of sister chromatids joined during meiosis?
AUntil anaphase I arrives
BUntil metaphase I arrives
CUntil anaphase II arrives
DUntil prophase II arrives
Answer & Solution
Correct answer: C. Until anaphase II arrives
1. Cohesin proteins clamp the two identical copies together as soon as replication finishes.
2. They survive anaphase I, which is why homologs separate but chromatids do not.
3. They are still holding through prophase II and metaphase II.
4. Only at anaphase II do the sister chromatids come apart.
5. Releasing them at anaphase I would produce two cells instead of the four meiosis needs.
_Source: OpenStax Biology 1e (CC BY 4.0), Chs 10 and 11, section 11.1 The Process of Meiosis_
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