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# Problem: 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 1/2have type B.

###### Problem Details

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.

What scientific concept do you need to know in order to solve this problem?

Our tutors have indicated that to solve this problem you will need to apply the Extensions to Mendel concept. You can view video lessons to learn Extensions to Mendel. Or if you need more Extensions to Mendel practice, you can also practice Extensions to Mendel practice problems.

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Based on our data, we think this problem is relevant for Professor Yeargain's class at UCF.