Under Which Scenario Will the Presence of Rare Recessive Deleterious

Multiple Choice

Under which scenario will the presence of rare recessive deleterious alleles cause the greatest decline in fitness in a population?

A) when the deleterious allele affects viability but not fecundity
B) when there is a high rate of migration from neighboring populations
C) when the rate of forward and back mutation are nearly equal
D) when mating occurs mostly among close genetic relatives