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Question

When do homologous chromosomes pair up ?

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

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'.

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