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  4. Sudden addition or deletion of genes by chance in a small population is called

Q. Sudden addition or deletion of genes by chance in a small population is called

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Solution:

Genetic drift or Sewall Wright effect is change in the allelic frequency of a population. This occurs due to random sampling and is seen in small populations. Genetic drift can be of two types: Bottleneck effect and Founder effect. When random change occurs in a population due to any disaster events ,it is known as bottlenec effect. In Founder effect only few individuals colonise an island thus changing the gene frequency.