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In underdominance, 1 allele will drift to extinction in a predictable fashion. True or False?

In underdominance, 1 allele will drift to extinction in a predictable fashion. True or False?

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Answer #1

False

The drift of the allele towards extinction is largely based on the population size as well. Though, in small populations it can observed that in case of underdominance allele extinction can be witnessed. But in large population if the homozygotes of the allele are in larger number then they will randomly mate with each other more. This means that there will be copies of allele are passed to the next generation. It may lead to disruptive selection but the allele will exist or one allele will be drawn to extinction. However, even if 1 allele drifts to extinction there is no way to declare it in a predictable fashion.

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