In humans, the allele for rh factor comes in two forms: rh+ and rh–. inheritance of the alleles determines whether an individual has either rh+ blood or rh– blood.

to identify the dominant form of the allele, which of these questions is the most useful to investigate?

a. which of the two alleles is more common in the human population?
b. which of the two blood types is more common in the human population?
c. which blood type forms when an individual receives two copies of one of the alleles?
d. which blood type forms when an individual receives one copy of each allele?