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Question

Which stage in prophase I of meiosis is characterised by the appearance of the recombination nodules?

A
Leptotene
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B
Zygotene
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C
Pachytene
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D
Diplotene
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Solution

The correct option is C Pachytene
During zygotene stage in prophase I of meiosis I, homologous chormosomes pair up to form a bivalent or tetrad. Bivalent refers to the 2 homologous chromosomes and tetrad refers to the 4 sister chromatids of the 2 homologous chromosomes.

After zygotene comes the pachytene stage. This stage is characterised by the appearence of recombination nodules at which crossing over occurs between non-sister chromatids of the homologous chromosomes.

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