Question

5. In a fourth family, one parent has blood type A and the other has blood type B. One of their children has blood type O. What can we deduce about the genotypes of the parents? List the parents’ genotypes. How would you describe the genotypes of the parents? (1 pt)

Answer 1

Answer: Genotype of parent with blood type A is I^Ai and genotype of parent with blood group B is I^Bi

Explanation: The alleles responsible for the human blood types are I^A, I^B, i.

I^A, I^B alleles are the dominant and i allele is recessive. Since human blood forming alleles are codominant. The dominant will be expressed. It is the case for both the parents.

Parent with blood type A have I^A and i alleles. I^Ais dominant over i and it forms the A blood group.

Parent with blood group B have I^B and i alleles. I^Bis dominant over i and it forms the B blood group.

The child with O blood group will have the genotype of ii, which came from each of the parents. Both the alleles are recessive and it formed O group.