During which stage do the chromatids of a bivalent become distinct?
A. Leptotene
B. Zygotene
C. Pachytene
D. Diplotene
Answer:C
During which stage do the chromatids of a bivalent become distinct?
A. Leptotene B. Zygotene C. Pachytene D. Diplotene
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.