is it possible to have parent who is blood type A to have an offspring who is blood type B?
a) no because A is dominant over O
b) yes, but only if the kid's mom has blood type O
c) yes, but only if the parent is a heterozygote
d) no, because A and B are codominant, so his kids could only be A or AB

Question

is it possible to have parent who is blood type A to have an offspring who is blood type B?
a) no because A is dominant over O
b) yes, but only if the kid's mom has blood type O
c) yes, but only if the parent is a heterozygote
d) no, because A and B are codominant, so his kids could only be A or AB

aaronq · Answer

c) yes, but only if the parent is a heterozygote

anonymous · Answer

B. Blood types are codominant and refer to proteins on the surface of a red blood cell.  O is the absence of these proteins.  If the other parent had B, then the offspring would have to have AB.

anonymous · Answer

Except the mom bit doesn't make sense.

anonymous · Answer

Oh, @aaronq Is also correct because ABxA could result in A or AB. So, there are two answers I guess.  He is right though, C is best because the "mom" thing does not make sense.

anonymous · Answer

Looks possible to me.