ANTH 101 Chapter Notes - Chapter 5: Genetic Drift, Dwarfism, Gene Flow
Document Summary
Directional selection natural selection that drives evolutionary change by selecting for greater or lesser frequency of a given trait in a population. Stabilizing selection selection that maintains a certain phenotype by selecting against deviations from it. Gene flow movement of genes between populations. Migration refers to the whole animal on the move. Gene flow refers to the genetic material they carry with them in their genotypes. Admixture genetic contributions from another nearby population. Genetic drift change in frequency of a gene in a population over time caused entirely by random factors. Ex: a hurricane that wipes out 99% of the population is a random event. The smaller the population the larger the potential effect, the larger the potential effect of genetic drift on a population. Founder effect a component of genetic drift theory, stating that new populations that become isolated from the parent population carry only the genetic variation of the founders.
