Some studies have shown that a single copy of the cystic fibrosis disease allele can confer resistance to tuberculosis to a person. This is an example of
A - Heterozygote advantage
B - Gene dominance
C - Stabilizing selection
D - Disruptive selection
Answer: A - Heterozygote advantage
HETEROZYGOTE ADVANTAGE is a case in which the heterozygous genotype has a higher relative fitness than either homozygous genotype.