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| Description: TABLE 19.2 Frequency of Heterozygotes for Some Recessive Traits in Several Populations Trait Cystic fibrosis Sickle cell anemia Tay—Sachs disease Phenylketonuria Albinism Heterozygote Frequency 1/25 whites; much lower in those of West African or Asian descent 1/12 among those of West African ancestry; much lower in those of European or Asian descent 1/30 among descendants of Eastern European Jews; 1/350 among others of European descent 1/55 among those of European descent; much lower in those of West African or Asian ancestry 1/10,000in Northern Ireland; 1/67,8OO in British Columbia © Cengage Learning
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