Genetics problem A mother with type B blood has two children, one with type A bl
ID: 73753 • Letter: G
Question
Genetics problem
A mother with type B blood has two children, one with type A blood and one with type O blood. Her husband has type O blood.
Hint: Human blood type is determined by codominant alleles. There are three different alleles, Know as IA , IB, and i. The IA and IB alleles are codominant, and the i allele is recessive.
The possible human phenotypes for blood group are type A, type B, type AB, and type O. Type A and B individuals can be either homozygous (IA IA or IBIB) or heterozygous (IA i or IB i, respectively).
What is the genotype of the mother?
What is the genotype of her husband?
What are the genotypes of the children?
Could the husband be the father of one, both, or none of the children? Why?
Show a Punnett square cross as a part of your explanation.
Explanation / Answer
Since the parents have two children one with type A and one with type O blood group, the genotype of the mother can be IBi.
The genotype of her husband is ii.
The genotypes of the children are IAi, and ii
Yes, the husband may be the father of one of the children with blood group O.
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