'A brief reduction in size of a population,du | vedclass

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(B) The phenomenon where a population's size is drastically reduced due to natural disasters,leading to a change in allele frequencies by chance,is kn

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Polydactylic dwarfs in Amish population

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(B) The phenomenon where a population's size is drastically reduced due to natural disasters,leading to a change in allele frequencies by chance,is known as the bottleneck effect,a type of genetic drift.In the case of the Amish population of Lancaster,$USA$,a small group of founders (some of whom carried the gene for polydactyly) established the community.Due to the small size of the initial population and subsequent isolation,the frequency of the polydactyly allele became significantly higher than in the general population,which is a classic example of genetic drift (specifically the founder effect,often associated with bottleneck events in population history).

'$A$ brief reduction in size of a population,due to natural calamities,usually leads to random genetic drift'. For this statement,identify the correct example from the following.

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