Problem:
Question: What is the genetic basis of the A/B/B+/O/etc. blood type system? Are there definitive loci that correspond to each or can multiple different genotypes produce the same antigen profile?
Question: Is the blood type of a child necessarily one of the blood types of the parents, or can an A/B female cross to A/B male produce a child with blood type O?
Could someone help to explain the answer of these questions.