Answer:
The frequency of certain genetic disorders among the American Amish population can be explained by a combination of factors, including the small, closed nature of the Amish community and their tradition of consanguineous marriage.
The Amish population has a high rate of consanguineous marriages, or marriages between individuals who are related by blood. This practice increases the likelihood of genetic disorders being passed down from one generation to the next. Additionally, the Amish community is relatively isolated, and its members have limited opportunities to intermarry with individuals outside of the community. This lack of genetic diversity can also contribute to the higher frequency of certain genetic disorders.
Overall, the high rate of genetic disorders among the American Amish population is a result of both their cultural practices and their demographic structure, which leads to limited genetic diversity and a higher frequency of genetic disorders.