Question

bivalents
how many bivalents are formed in a cell with 20 chromosomes at the beginning of meiosis i?
multiple choice
20
1
40
10
5

Explanation:

Step1: Understand the concept of bivalent

A bivalent is formed by a pair of homologous chromosomes.

Step2: Calculate the number of bivalents

If there are \(n = 20\) chromosomes at the beginning of meiosis I (diploid state, \(2n\)), the number of homologous chromosome pairs (bivalents) is \(\frac{n}{2}\). Substituting \(n = 20\), we get \(\frac{20}{2}=10\).

Answer:

10