Question

if a person who is blood type O marries a person who is blood type A, what are the possible blood types their children could have

Answer 1

The possible blood types their children could have are A or 0.

Step-by-step explanation:

The I gene determines the blood type of a person. I is the dominant allele, while i is the recessive allele.

• IA dominant over i. The person presents A type of antigens.

• IB dominant over i. The person presents B type of antigens.

• IA and IB are codominant. The person presents both types of antigens, A and B.
• i is the recessive allele. The person does not present any antigen.

Cross: a person who is blood type O with a person who is blood type A

Parental) ii x IA-

Gametes) i i IA -

Punnet Square) IA -

i IAi -i

i IAi -i

The - symbol represents the possibility of either IA allele or i allele. This is, the parental with blood type A might have the genotype IAIA or IAi

F1) 2/4 = 1/2 IAi

2/4 = 1/2 -i (-i could be either IAi or ii, depending on the genotype of the parental with blood type A)

• Option 1: ii x IAIA

F1) 100% IAi (The whole progeny will have blood type A)

• Option 2: ii x IAi

F1) 50% IAi (Half of the progeny will have blood type A)

50% ii (Halfa of the progeny will have blood type 0)

The possible blood types their children could have are A or 0.