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Tay Sachs disease is a fatal disorder in children (usually by age 5) that causes a progressive degeneration of the

central nervous system. It is caused by the absence of an enzyme called hexosaminidase .A (or hex A). Without hex A, a fatty substance builds up on the nerve cells in the body, particularly the brain. In some eastern European populations as many as 1 in 25 adults may be heterozygous for the condition.


What is the frequency of adults homozygous for the normal allele in this population?


A. 0.98


B. 0.96


C. 0.92


D. 0.90

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