Which Genotype Doesn't Have the Rh Factor on the Red

Question

Which genotype doesn't have the Rh factor on the red blood cells?
A) Rh+ Rh+
B) Rh+ Rh-
C) Rh- Rh+
D) Rh- Rh-

Accepted Answer

Only individuals with the genotype Rh- Rh- do not have the Rh factor on their red blood cells. The alleles for Rh factor are dominant, meaning that if an individual has at least one Rh+ allele (either Rh+ Rh+ or Rh+ Rh-), they will express the Rh factor on their red blood cells. However, individuals with the genotype Rh- Rh- have two recessive alleles for Rh factor, and therefore do not express it on their red blood cells.