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Number of bivalents (paired homolog pairs) at metaphase I of a cell with 2n = 12:
A3
B24
C6 (n bivalents, where n = 6 since 2n = 12)
D12
Answer & Solution
Correct answer: C. 6 (n bivalents, where n = 6 since 2n = 12)
Bivalents (tetrads): pairs of homologous chromosomes held together. For 2n=12, n=6 bivalents. Each bivalent has 4 chromatids. Visible at metaphase I aligned at equator. Reductional division separates the two homologs.
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