Refer to the birth of a child with blood type A to a mother with blood type B
(B) Either AB orB
(C) Either AB or 0
(D) Either AB or A
(E) AB or A or O
Answer: D
(A) She contributes an 18 allele, which is recessive to the father's I A allele.
(B) She contributes an i allele, which is recessive to the father's I A allele.
(C) She contributes an 18 allele, which is codominant to the father's I A allele.
(D) She contributes an i allele, which is codominant to the father's 18 allele.
(E) She is homozygous for the 18 allele.
Answer: B
The father must have which of the following blood types?
(A) AB only(B) Either AB orB
(C) Either AB or 0
(D) Either AB or A
(E) AB or A or O
Answer: D
If the father has blood type AB, which of the following statements is correct about the mother?
(A) She contributes an 18 allele, which is recessive to the father's I A allele.
(B) She contributes an i allele, which is recessive to the father's I A allele.
(C) She contributes an 18 allele, which is codominant to the father's I A allele.
(D) She contributes an i allele, which is codominant to the father's 18 allele.
(E) She is homozygous for the 18 allele.
Answer: B