Biology Practice Problems Extensions to Mendel Practice Problems Solution: In a possible paternity case a child's blood type ...

Solution: In a possible paternity case a child's blood type was found to be type O. If the father in question has type A blood, would this exclude him as the possible father. Why or why not? What blood type would exclude him from paternity in this case?

Problem

In a possible paternity case a child's blood type was found to be type O. If the father in question has type A blood, would this exclude him as the possible father. Why or why not? What blood type would exclude him from paternity in this case?

Solution

For the blood groups in humans, the two alleles for individual's blood type is defined by three possible alleles: IA, IB, and i. With these multiple alleles, IA and IB are exhibiting codominance. This means that their respective phenotypes are expressed as long as at least a copy is present in the genotype. The allele i is the recessive allele, and an individual that is homozygous for that allele would have the blood type O.

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