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Three children of a family have blood gr...

Three children of a family have blood groups A, AB and B. What could be the genotypes of their parents?

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a. Genotypes of parents `= L ^(A) L^(0) xx L^(B)L^(0)`

b. The other possible genotynes are AB, A and B. The ratio is `1:1:1:1 (AB : A:B:0)`
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