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

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The founder effect is an example of genetic drift in which rare alleles,or combinations of alleles,occur at a higher frequency in a population isolated from the general population.Founding individuals could contain only a fraction of the total genetic diversity of the original gene pool.Which alleles the founders carry is dictated by chance alone.The Amish of Lancaster County,Pennsylvania,are an isolated group that was begun by German founders.Today,as many as 1 in 14 individuals carries a recessive allele that causes an unusual form of dwarfism.In the general population,only one in 1,000 individuals has this allele.

The Amish of Lancaster,PA,have a Higher Frequency of an Unusual