MEIOSIS

by • 14/07/2011 • Old Pattern Biology NotesComments (0)582

It is similar to mitosis. The haploid cells formed in meiosis I pass through phases of meiosis II and ultimately four haploid (n) daughter cells are formed. These cells afterwards change into spores (in plants or gametes (animals)

Significance of Meiosis

1. Meiosis takes place only in germ mother cells which form gametes or spores.

2. It maintains the chromosome number of a species constant generation after generation.

3. If gametes had the same number of chromosomes as in somatic cells, the number of chromosomes would have doubled after each generation in a species.

4. The number of chromosomes is constant for each species. During meiosis; gametes (both and) formed are haploid.

5. Gametes unite to form a diploid zygote.

6. During meiosis, pairing of chromosomes takes place which is called synapsis.

7. Exchange of genetic material occurs during meiosis. In this way variations are produced which are raw material for evolution.

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