A small, isolated island population of finches experiences a drastic reduction in population size due to a volcanic eruption. The surviving finches have a different average beak size compared to the original population. This change is primarily attributed to:
Directional selection
Founder effect
Bottleneck effect
Disruptive selection
Related Questions
Mutation introduces new genes into a species and brings about the changes in
Gene pool and phenotype
Gene frequency and genotype
Genetic drift and gene flow
Chromosomes and genotype
