In humans, the ABO blood groups are controlled by three alleles (only two of which occur in any one individual): the alleles for A and B type blood are co-dominant toward each other, and both are dominant to the allele for O type blood.
i) If a person with type AB blood marries someone with type O blood, what are the possible phenotypes of their offspring?
In the following, determine the genotypes of the parents:
ii) One parent has type A and the other has type B, but all four blood groups are represented in the children.
iii) Both parents have type A, but 3/4 of the children are A and 1/4 are O.
iv) One parent has type AB and the other has type B, but of the children 1/4 have type A, 1/4 have type AB, and 1/2
have type B.
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