Quick change in phenotypes in a small band of colonisers is called

Founder effect

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Genetic bottleneck

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Genetic drift

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Gene flow

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Solution

The correct option is B Founder effect
By genetic drift often the phenotype of this small population quickly become different from the parental population and some time from a new species. Such an effect is called Founder effect. It is the elimination or addition of the genes of certain characters when some animals in population migrate or dies or immigrate.
So, the correct option is 'Founders effect'.

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