13. Mendelian Genetics

If you look at a blood sample from a person who is heterozygous at the sickle cell locus you will see both normal circular red blood cells and sickle-shaped red blood cells. This is an example of

A gene for the MN blood group has codominant alleles M and N. If both children in a family are of blood type M, which of the following situations is possible?

The number of different alleles for ABO blood types is _____ resulting in _____ different blood types.

A man with type A blood marries a woman with type B blood. Their child has type O blood. What are the genotypes of these three individuals? What genotypes, and in what frequencies, would you expect in future offspring from this marriage?

A man with type B blood and a woman who has type A blood could have children of which of the following phenotypes?

a. A or B only

b. AB only

c. AB or O

d. A, B, AB, or O