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CBSE - X - Biology - Heredity and Evolution

define variation,heredity, genetic drift,organic evolution.

Asked by sangavi519 1st October 2009, 8:50 AM
Answered by Expert


Evolution is a gradual and continuing process of change that occur over a period of time, due to slight variations in genetic compositions as well as changes in environment, leading to formation of new species.


Genetic drift is the random change in the frequency of genes or factors in a population over successive generations in a small population, presumably owing to chance rather than natural selection.

Kindly post remaining queries separately.

Answered by Expert 4th October 2009, 6:39 AM

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