Two parents think their baby was switched at the hospital. Its 1968, so DNA fingerprinting technology
does not exist yet. The mother has blood type "O," the father has blood type "AB," and the baby has
blood type "B."
a. Mother’s genotype: _______
b. Father’s genotype: _______
c. Baby’s genotype: ______ or ________
d. Punnett square showing all possible genotypes for children produced by this couple
e. Was the baby switched?
Answer (1)
A person with blood type O (ii) cannot pass an A or B allele. A father with AB has no i allele. Therefore, they cannot produce a child with genotype Bi. Mother’s genotype: ii (because she is blood type O)Father’s genotype: AB (because he is blood type AB)Baby’s genotype: Bi or Ai (but baby is blood type B, so IBi only applies)Punnett Square of Possible Genotypes[tex]\left[\begin{array}{ccc}&A&B\\i&Ai&Bi\\i&Ai&Bi\end{array}\right][/tex]The baby was likely switched at birth.
