It is a random, change in gene frequency , occurring in small populations
so that one allele gets “ fixed” (reaches 100% frequency) and the other gets “
eliminated” (reaches 0% frequency ), purely by chance.
It is not related to usefulness of a gene, consequently a useful allele may be eliminated, purely by chance, and a harmful allele may get “fixed” in the population.
This is characteristic of lemming populations in arctic areas, or small island population, where a population may suddenly crash due to severe cold or disease or some other reason.
This is also known as bottle-neck phenomenon or founder’s Principle.
It is not related to usefulness of a gene, consequently a useful allele may be eliminated, purely by chance, and a harmful allele may get “fixed” in the population.
This is characteristic of lemming populations in arctic areas, or small island population, where a population may suddenly crash due to severe cold or disease or some other reason.
This is also known as bottle-neck phenomenon or founder’s Principle.
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