A parent with type AB blood could not produce a child with type 

A. AB.
B. A.
C. B.
D. O.

I am stuck!

4 answers

My sister said D, but I still wasn't sure.
http://answers.yahoo.com/question/index?qid=20100307101315AAfLFVi
They can pass down either an A or B allele, which would mean their child could only be A, B, or AB. If the other parent is type O, the child's blood type will be the allele he/she got from the AB parent.

A child can only be O if it inherits an O allele from BOTH parents.
Parents are AB- RH NEG and A+ RH+. What blood type could their children be?