Final answer:
When population size is small, genetic drift can be more powerful than gene flow and result in the random fixation of deleterious alleles. option d is answer
Step-by-step explanation:
Genetic drift can be much more powerful than gene flow when the population size is small. This can result in the random fixation of neutral alleles. Gene flow refers to the movement of alleles into or out of a population due to migration, while genetic drift is the change in allele frequencies due to chance events.
In small populations, genetic drift can have a stronger impact because chance events can easily cause a particular allele to become fixed in the population, even if it does not provide any advantage or disadvantage. . option d is answer