The human ABO blood typing system is an example of multiple alleles, codominance, and complete dominance?

all three types of inheritance are present. A= A allele B= B allele and i= O allele. A women with blood type A has a child with blood type O. Which of the following men could NOT be the father of this child?


a) type A


b) type B


c) type O


d) type AB

The human ABO blood typing system is an example of multiple alleles, codominance, and complete dominance?
The genotype of someone who is blood type A is either AA or AO ("Ai" in your nomenclature above). Also, a person who is blood type O is genotype OO. So, if the mother is type A and had a child who is blood type O, then the mother must have been AO for the child to be type O. The father must have been able to contribute an O allele, so he could be AO, BO, or OO, but could not be AB. So, the answer is d.
Reply:Is codominance, the example that you says is:





The genotype of mother is Ai (heterozigoto) and her child is Blood type O (ii) then father could be B (Bi), O (ii) or A (Ai), no AB because AB genotype is AB both gens dominants, then the answer is d)... I hope it be useful....

surveys