Genetic drift is a unique evolutionary force. Genetic drift acts entirely random and has no bias towards any phenotype. Populations that undergo genetic drift experience fluctuating phenotype and genotype ratios. What really sets genetic drift apart is the it always moves towards fixing a certain allele. It can be either the dominant or recessive since it is random selection. After a certain number of generations only undergoing genetic drift there will only be one allele type left. This is because as individuals are selected to reproduce, allele frequencies change. Even if both alleles start out equal, one will be favored over the other due to random chance. This will lead to a divergence that eventually leads to allele fixation. Genetic drift causes populations to differentiate.
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