In humans, a rare blood disoder (Blood Disorder X), which only affects people with sickle cell anemia and blood type B, has been discovered. 2 people are expecting their
first child. One parent has sickle cell anemia and blood type AB. The other is a carrier of
sickle cell anemia and also has blood type AB. What are the chance their child will be at
risk for the blood disorder X? *sickle cell is not sex-linked.