Question

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

• A. four; two
• B. one; two
• C. two; two
• D. two; one

Answer 1

The correct option is D 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 a pair homologous chromosomes will have two pairs of sister chromatids.