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Question

Which stage of meiotic prophase shows terminalisation of chiasmata as its distinctive feature?

A
Pachytene
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B
Leptotene
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C
Zygotene
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D
Diakinesis
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Solution

The correct option is D Diakinesis
The prophase I of meiosis I includes five phases:

Leptotene: Compaction of chromosomes.

Zygotene: Pairing of homologous chromosomes.

Pachytene: Crossing over between the non-sister chromatids of the homologous chromosomes, leading to recombination of genetic material.

Diplotene: The recombined homologous chromosomes tend to separate from each other due to the dissolution of the synaptonemal complex except at the site of crossovers. These X-shaped structures are called chiasmata.

Diakinesis: Terminalisation of chiasmata. The displacement of chiasmata is termed as terminalisation.

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