The Amish of Lancaster,PA.have a higher frequency of an unusual form of dwarfism than the population at large.This is probably due to

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This is likely a founder effect, where a small group of individuals with the dwarfism allele founded the Amish community and their descendants passed down the allele generation after generation. Because the community remains largely isolated and intermarriage is common, the frequency of the allele remains higher than in the larger population.