Question

In meiosis I, a bivalent is an association of

• A. Four chromatids and four centromeres.
• B. Two chromatids and two centromeres.
• C. Two chromatids and one centromere.
• D. Two chromatids and four centromeres
• E. Four chromatids and two centromeres.

Answer 1

The correct option is E Four chromatids and two centromeres.

Term bivalent is used to denote a pair of homologous chromosome. Each chromosome of such a pair is made up of two chromatids joined together at the centromere. Thus, each bivalent is actually made up of total four chromatids and two centromeres.