A bivalent consists of pair/pairs sister chromatid/chromatids and pair/pairs of homologous chromosomes.

one; two

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two; two

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two; one

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four; two

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Solution

The correct option is C two; one
The bivalent is a structure which is formed by a pair of synapsed chromosomes in the pachytene stage of prophase I of meiosis I. Each bivalent consists of one pair of homologous chromosomes. Each of these homologous chromosomes have two sister chromatids attached at the centromere. Thus, the bivalent, consisting of two homologous chromosomes will have two pairs of sister chromatids.

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