This is the properly explained question. You have to produce annotated drawings about the chromosome's behaviour...

This is the properly explained question. You have to produce annotated drawings about the chromosome's behaviour during cell division under meiosis justify the crossing over events and breaking of the centromeres event in Meiotic cell division.

Expert Solution

When a cell divides into 2, a cell division takes place. There are 2 types of cell division - meiosis and mitosis.

Mitosis is called Equational division because the daughter cells derived from the parent cells are genetically identical to the parent cells. This type of division takes place during growth and repair of body cells. Moreover, a parent cell produces 2 daughter cells.

Meiosis is called Reductional Division because the number of chromosomes are reduced to half . This type of division takes place during gametes formation. One parent cell gives rise to 4 daughter cells.

In general , mitosis and meiosis consists of common stages called prophase, metaphase, anaphase and the telophase. Between the telophase of 1 cell division and the prophase of another division, a resting phase or interphase exists where a cell prepares for the next division..

Meiosis consists of 2 phases- meiosis 1 and meiosis 2.

Each of these phases consists of prophase, metaphase, anaphase and telophase.

First meiotic prophase in turn consists of 5 sub-phases called Leptotene, Zygotene, Pachytene, Diplotene and Diakinesis.

Crossing over takes place during the Pachytene Stage of Meiosis 1. Crossing over is an exchange of chromatid segments between non-sister chromatids of each tetrad. The non-sister chromatids of a tetrad break at identical points. This breaking is favoured by the enzyme endonuclease. The broken segments of non-sister chromatids interchange, the enzyme ligase favours the event. The point of interchange and rejoining appears X-shaped and is called Chiasma.. as a result of crossing over, new combinations of hereditary materials are formed.

gladiator answered 2 years ago

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This is the properly explained question. You have to produce annotated drawings about the chromosome's behaviour...

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