Question

what are the five types of Prophase??nd write their function..

Answer 1

Hello everyone..
Prophase I is divided into 5 distinctive sub-stages:

Leptotene – The chromosomes begin to condense and are attached to the nuclear membrane via their telomeres

Zygotene – Synapsis begins with a synaptonemal complex forming between homologous chromosomes

Pachytene – Crossing over of genetic material occurs between non-sister chromatids

Diplotene – Synapsis ends with disappearance of synaptonemal complex; homologous pairs remain attached at chiasmata

Diakinesis – Chromosomes become fully condensed and nuclear membrane disintegrates prior to metaphase I.


Hope this helps you...

Answer 2

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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