Question

When do homologous chromosomes pair up ?

• A. Only in mitosis
• B. Only in meiosis I
• C. Only in meiosis II
• D. In both mitosis and meiosis

Answer 1

The correct option is B Only in meiosis I

In metaphase, I of meiosis I, the pairs of homologous chromosomes, also known as bivalents or tetrads, line up in a random order along with the metaphase plate. The random orientation is another way for cells to introduce genetic variation.

So, the correct answer is 'Only in meiosis I'.