Question
Biology Question on cell cycle and cell division
A bivalent of meiosis I consists of:
A
Four chromatids and two centromeres
B
Two chromatids and one centromere
C
Two chromatids and two centromeres
D
Four chromatids and four centromeres
Answer
Four chromatids and two centromeres
Explanation
Solution
A bivalent chromosome represents a duo of homologous chromosomes, both having undergone DNA replication. Each individual chromosome comprises two chromatids joined by a single centromere. Likewise, a bivalent chromosome consists of four chromatids. Each chromosome bears a centromere that binds two chromatids together.
So, the correct option is (A): Four chromatids and two centromeres.