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Question

The chromosomes appears as long thin threads in

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 A Leptotene

Leptotene is the first stage of the prophase of meiosis, during which each chromosome becomes visible as two fine threads.
Zygotene is the second stage of the prophase of meiosis, during which homologous chromosomes begin to pair.
Pachytene is the third stage of the prophase of meiosis, during which the paired chromosomes shorten and thicken, the two chromatids of each separate, and exchange of segments between the chromatids occurs.
Diplotene is the fourth stage of the prophase of meiosis, following pachytene, during which the paired chromosomes begin to separate into two pairs of chromatids.

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