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With the help of suitable diagrams,
explain the five stages of prophase-I
of meiosis.​

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Biology

Cell Cycle and Cell Division

Meiosis

Explain the stages of proph...

BIOLOGY

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Asked on December 20, 2019 by

Aatif Sampathi

Explain the stages of prophase I of meiosis.

MEDIUM

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ANSWER

The prophase I of meiosis occurs in the following stages:

1. Leptotene- This phase is the start of prophase-I. It is marked by the condensation of the chromosomes.

2. Zygotene- In this phase the homologous chromosomes start pairing up, called the synapsis. The synaptonemal complex starts building up. This complex is required to hold the homologous chromosomes at a place close to each other. Bivalent chromosomes are visible at this stage.

3. Pachytene- In this stage, this non-sister chromatids of homologous chromosomes exchange their parts, the process is called the crossing over. The attachment point of the crossing-over of the non-sister chromatids is called chiasma.

4. Diplotene- The crossing-over process is completed by this stage. The homologous chromosomes remain attched at the point of chiasma.

5. Diakinesis- The homologous chromosomes start to separate and synaptonemal complex disappears. The nuclear membrane also disappears.

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