A bivalent of meiosis-1 consists of

Options

A. two chromatids and one centromere
B. two chromatids and two centromeres
C. four chromatids and two centromeres
D. four chromatids and four centromeres

Answer

C

Explanation

Each pair of homologous chromosome carrying one maternal and one paternal chromosome of similar type is called bivalent. Each chromosome has two sister chromatids and a centromere. Thus, bivalents possesses four chromatids, two centromeres. This bivalent with four chromatids is called pachytene tetrad (quadrivalent).