For human blood type, the alleles for types A and B are codominant, but both are dominant over the type O allele. The Rh factor is

Question

separate from the ABO blood group and is located on a separate chromosome. The Rh+ allele is dominant over the Rh- allele.
Indicate the possible phenotypes from the mating of a type O- woman with a type A+ man. Keep in mind that while there is only one
possible genotype for blood type O-, there are four possible genotypes for an A+ blood type. Consider all of them.
Hint: the genotype for the O- mother is IoIo Rh-Rh-(which may be expressed as O-O-); therefore, she produces IoRh-(or O-) gametes only.