What is it called when a part of a population | vedclass

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(A) When migration of a section of population to another place and population occurs,gene frequencies change in the original as well as in the new pop

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Gene flow

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(A) When migration of a section of population to another place and population occurs,gene frequencies change in the original as well as in the new population. New genes/alleles are added to the new population and these are lost from the old population. There would be gene flow if this gene migration happens multiple times. If the same change occurs by chance,it is called genetic drift.

What is it called when a part of a population migrates repeatedly to another population?

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