The genes for cystic fibrosis and blood group are not linked. Two parents are heterozygous for cystic fibrosis. One parent has blood group O and the other has blood group AB. Using a Punnett square, determine the probability that their child will have both cystic fibrosis and blood group A. In your answer include parents genotype, gametes for each parent and probability that a child will have both cystic fibrosis and Blood group A.