Question

Describe the different phases of meiotic prophase -1 Mention the chromosomal events during each stage



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Answer 1

Answer:

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Explanation:

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Answer 2

Explanation:

Stages of the meiotic prophase of the oocyte. In the prophase of the first meiotic division various stages can be distinguished: leptotene, zygotene, pachytene, diplotene, diakinesis. In the Meiosis of the oocyte an in-between stage is added: the dictyotene, the so-called interphase.

Prophase I. Prophase I is divided into five phases: leptotene, zygotene, pachytene, diplotene, and diakinesis.

Prophase 1 of Meiosis is the first stage of meiosis and is defined by five different phases; Leptotene, Zygotene, Pachytene, Diplotene and Diakinesis (in that order).

Interphase 1 (definition) Chromosomes are in a threadlike form.

Prophase 1 (definition) Each chromosome is made up of 2 chromatids.

Metaphase 1 (definition)

Anaphase 1 (definition)

Telophase 1 (definition)

Cytokinesis 1 (definition)

Prophase 2 (definition)

Metaphase 2 (definition)

Pachytene

Longest phase of prophase-I of meiosis is Pachytene.As mentioned in study material.

During prophase I, they coil and become shorter and thicker and visible under the light microscope. The duplicated homologous chromosomes pair, and crossing-over (the physical exchange of chromosome parts) occurs. The nuclear envelope disappears at the end of prophase I, allowing the spindle to enter the nucleus.

Zygotene or Zygonema - Pairing of homologous chromosomes, i.e. synapse, occurs to form bivalents. Here, pairing occurs between one paternal and one maternal chromosome. 3. Pachytene or Pachynema - Chromosomes remain paired up at points called chiasmata.

Prophase I. In most higher organisms, prophase 1 can last several days. During prophase, I chromosomes pair, condense and crossing over occurs between non-sister chromatids.

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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