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
No, type B blood must be homozygous
b
No, this is impossible
c
Yes, if one parent is heterozygous
d
Yes, if both parents are heterozygous
c. Yes, if one parent is heterozygous
Punnett square for Sarah:
A A
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O O
Punnett square for Jesse:
O O
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O O
Possible genotypes for Sarah: AO
Possible genotypes for Jesse: O
Punnett square for possible genotypes:
A O
A AO
O OO
Based on the Punnett square, it is possible for Jesse to be the father if Sarah is heterozygous for blood type.