Name: Cell Cycle: The M Phase
Uploaded: 2019-07-19
Duration: 9 min 36 s
Description: After the Interphase, the cell is ready to divide! Let's check out this quick video lesson to learn the different processes that take place in the M Phase.

Question

With the help of diagrams only depict the events that occur during prophase I of meiotic division.

Accepted Answer

Meiosis is the complex type of cell division to form four daughter cells. It takes place in two stages: meiosis I and meiosis II. Prophase I is the longest phase of meiosis I that is divided into 5 substages: leptotene, zygotene, pachytene, diplotene and diakinesis.

Leptotene: The chromosomes start to appearing clearly as a result of condensation of chromatin fibres.

Zygotene: During this stage, two homologous chromosomes from male parent and female parent are attracted towards each other. It is called chromosome pairing or synapsis.

Pachytene: Crossing over is the exchange of genetic material between non-sister chromatids of homologous chromosomes.

Diplotene: In this stage, the homologous chromosomes repel each other after recombination due to a decrease in the force of attraction between them. The separating chromosomes are held together at one or more points called chiasmata.

Diakinesis: It is the last substage of prophase I. When the paired homologous chromosomes begin to separate, the chiasmata are gradually pushed to the terminal end of the chromosome. This process is called terminalisation of chiasmata.

With the help of diagrams only depict the events that occur during prophase I of meiotic division.

Important Questions on Cell Cycle and Cell Division

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