Genetic disorders such as Tay-Sachs disease,Bloom syndrome,Gaucher disease,and Canavan disease are more common in Ashkenazi Jewish populations because

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Ashkenazi Jews have gone through several population bottlenecks throughout their history, meaning that a small number of individuals survived and passed on their genes, resulting in a reduced genetic diversity within the population. This makes it more likely for rare genetic disorders to become more common within the population.

Genetic Disorders Such as Tay-Sachs Disease,Bloom Syndrome,Gaucher Disease,and Canavan Disease