Question

The following question deals with the ABO blood group. Recall that A and B alleles are co-dominant over the allele O. Jill, who has type AB blood, marries Jack who has type B blood, but whose mother has type O blood. What are the genotypes of Jack, Jill, and Jack's mother?

Answer 1

Jill genotype will be expressed predominately

Step-by-step explanation:

Further explanation is given in the picture

Answer 2

Answer: Jack has the genotype Bo; Jill is AB; Jack's mother is OO.

Explanation: In the ABO blood type, the alleles A and B are dominant over O. However, the allele A is co-dominant with the allele B. That means an individual can have a genotype AB, which is Jill's case: her blood type has the two allele. For Jack's mother, her blood type is O. As O is recessive, her genotype will be OO, indicating the recessiveness. For Jack, his mother is recessive, so he will have genotype heterozygous for blood type B, which means BO.