A man with type B blood starts a family with a woman  having type A blood. The woman's parents both have  type AB blood. What is the probability that the couple's  first child will be a boy having type O blood?

If a man with type O blood has a child with a woman who is heterozygous for type B blood, what are the possible blood types for this child?

A woman with type A blood marries a man with type O blood. They have six children, all of whom have type A blood. What are the probable genotypes of the parents? Could they ever have a child with type O blood?

In blood groups, Rh positive blood is dominant (R) over the gene for Rh negative blood (r). What types of offspring could be expected for an Rh positive AB woman, (whose father was Rh negative), who marries a man with heterozygous A positive blood?

Sunday Afternoon It’s another beautiful day in Springfield and the Simpson family has decided to take a family outing to the Springfield Clinic to have their blood types tested. A few pin-pricks later, they have their information, which is summarized in the table below. (If you’ve been marooned on a deserted island without TV reception for the past 20 years: Homer and Marge are the parents; Bart, Lisa and Maggie are their three children.) Complete the table. Simpson Blood Type RBC Antigens Plasma Antibodies   Homer   A-negative A Anti B Marge   B-positive B Anti A Bart   O-positive None Anti A and Anti B Lisa   A-negative A Anti B Maggie   AB-negative A and B None   Monday Afternoon The following day, tragedy strikes as Bart rushes home from school on his skateboard. Approaching an intersection, he fails to use proper safety procedures and he careens into the intersection without looking both ways. Before he can utter,…

A couple finds out that both the male and the female are heterozygotes (carriers) for Tay Sachs. Draw a punnet square for this couple. What is the likelihood that this couple will have an offspring with Tay Sachs?