Final answer:
Genetic drift, gene flow, mutation, nonrandom mating, and environmental variances are other evolutionary forces that have shaped human genetic and phenotypic diversity in addition to natural selection.
Step-by-step explanation:
In addition to natural selection, other evolutionary forces that have shaped human genetic and phenotypic diversity include genetic drift, gene flow, mutation, nonrandom mating, and environmental variances. Genetic drift refers to the chance occurrence that some individuals in a population have more offspring than others, leading to changes in allele frequencies. Gene flow occurs when individuals leave or join a population, causing changes in allele frequencies. Mutations introduce new variation into a population's genetic pool. Nonrandom mating, such as mate choice based on phenotypes, can also change gene frequencies. Lastly, environmental variances can influence the phenotypes of individuals in a population.