Fitness- Average number of offspring produced by a genotype and divide it by the mean number of offspring produced by the most prolific genotype

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Balance natural selection

Balancing selection is a type of natural selection that maintains genetic diversity in a population.

In balancing selection, two or more alleles are kept in balance, and therefore are  maintained in a population over the course of many generations.

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Evolution by natural selection occurs if variation must lead by Ecotypes. 

Ecophene is not be selected by natural selection

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Change in environmental condition is not necessary for natural selection.

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Genetic drift 

Genetic drift is an evolutionary force, in which allelic frequency change over generation Just by chance (sampling error). 

The deviations from the expected ratios are random, the direction of change is unpredictable.

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#Section 3: Genetics, Cellular and Molecular Biology

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#Section 3: Genetics, Cellular and Molecular Biology

CAUSES OF GENETIC DRIFT

Genetic drift in a small population over multiple generations can significantly affect the composition of a population’s gene pool.