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CBSE Class 9 Answered

cell division
Asked by aadityajain | 26 Mar, 2010, 05:12: PM
Expert Answer

A brief idea of mitosis and meiosis and their diiferences are given here. About the phases of mitosis and meiosis, tell me specifically the part that you are not understanding.

Mitosis is an equational division in which a cell replicates to form two daughter cells with identical sets of chromosomes.

Meiosis is a reduction division in which each daughter cell receives half the amount of DNA as the parent cell. Meiosis occurs during formation of egg and sperm cells in mammals.

Mitosis occurs in somatic cells whereas meiosis occurs in reproductive cells.

In mitosis, the daughter cells have same number of chromosomes as parent cells whereas in meiosis, the daughter chromosomes have half the number of chromosomes as parent cells.

In mitosis, 2 daughter cells are formed from one parent cell whereas 4 daughter cells are formed in meiosis.

Mitosis helps to achieve growth of body and also repair of tissues. Meiosis conserves the chromosome number in a sexually reproducing species, from one generation to the next.

Mitosis involves a single division whereas meiosis involves 2 successive divisions.

Crossing over and pairing of homologous chromosomes occurs in meiosis but not in mitosis.

Meiosis helps in evolution because it introduces genetic variations. Mitosis does not help in evolution

 

Answered by | 30 Mar, 2010, 09:31: AM
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