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During which stage do the chromatids of a bivalent become distinct?

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in Biology – Class 11 by (272k points)
During which stage do the chromatids of a bivalent become distinct?

(a) Leptotene

(b) Zygotene

(c) Pachytene

(d) Diplotene

This question was posed to me during an interview.

Question is taken from Cell Cycle and Division in division Cell Cycle and Cell Division of Biology – Class 11

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Correct choice is (c) Pachytene

For explanation: Bivalent or tetrad formation takes place during the zygotene stage of prophase I, after synapsis has occurred and homologous chromosomes form pairs. However, the bivalent is distinct only in the next stage, pachytene.

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