What are the expected blood types of children from a mother who is AA for blood type and a father who is BB for blood type?
A. All children will have type O blood.
B. All children will have type AB blood.
C. 50% of the children will have type A blood and 50% of the children will have type B blood.
D. 25% will have type A blood, 50% will have type AB blood, and 25% will have type B blood.
B
Because the parents are each homozygous for the two blood type alleles, each parent will contribute a different allele for blood type. The mother will always contribute an A allele and the father with always contribute a B allele. Thus, the genotypes for blood type for any of their children will always be heterozygous with one A allele and one B allele. The A and B alleles for blood type are each dominant (co-dominant) and would both be expressed in the child's phenotype as type AB blood.
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