Final answer:
Yes, a man with type A blood and a woman with type B blood, both heterozygous, can have a child with type O blood with a probability of 25%. The ABO blood group system exemplifies multiple alleles and codominance.
Step-by-step explanation:
Can a Child of Type A and Type B Parents Have Type O Blood?
If a man who is heterozygous for type A blood (genotype IAi) marries a woman who is also heterozygous for type B blood (genotype IBi), they can indeed have a child with type O blood (genotype ii). To calculate the probability, we use a Punnett square.
Considering each parent's genotype, the possible combinations for their children are:
IAIB (type AB)
IAi (type A)
IBi (type B)
ii (type O)
As each combination has an equal chance of occurring, there is a 25% chance that the child will have type O blood.
Regarding the blood donation question, the woman can donate blood to her husband if he has type A blood because type B is compatible with type A as a recipient. However, her AB or B antigens would not be compatible with type O recipients. ABO blood groups exemplify multiple alleles and codominance.