Sarah has type A blood, and Jesse has type O blood. Their son has type B blood. Can Jesse be the baby daddy? He is a bit worried.
Please complete the Punnett squares to determine the possibilities.
a
Yes, if one parent is heterozygous
b
No, type B blood must be homozygous
c
Yes, if both parents are heterozygous
d
No, this is impossible
The possible genotypes for Sarah and Jesse are:
Sarah: AO
Jesse: OO
Punnett square:
O O
A AO AO
O OO OO
The Punnett square shows that there is a possibility that both parents are carriers of the B blood type allele, making it possible for their son to have type B blood. So, yes, Jesse can be the baby daddy. The correct answer is:
a) Yes, if one parent is heterozygous