The occurrence of large or small beak size among seed crackers in the absence of medium sized beaks is an example of
1) directional selection
2) disruptive selection
3) normal distribution
4) stabilizing selection

Gene flow and genetic drift both affect allele frequencies in a population. a high level of gene flow into a population genetic diversity in a population. a high level of gene flow out of a population genetic diversity in a population. genetic drift is the change in allele frequencies due to factors. typically, genetic drift has the biggest impact on populations.