The disease frequency for sickle cell anemia in the African-American population is 1 in 400. What is the carrier frequency in this population?
A、1 in 5
B、1 in 10
C、1 in 20
D、1 in 40
E、1 in 50
F、1 in 100
发布时间：2025-10-12 09:10:24
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答案：B
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