Biology PDF
Document Details
Uploaded by Deleted User
Tags
Summary
This document discusses the concepts of evolution and speciation, including different types of selection (stabilizing, directional, and disruptive) and the role of genetic drift and gene flow. It includes diagrams illustrating these processes.
Full Transcript
Evolution& speciation ↑ Evolution: change in allele frequencies in a population over Genetic drift: changes allele time frequency...
Evolution& speciation ↑ Evolution: change in allele frequencies in a population over Genetic drift: changes allele time frequency due to random chance events Stabilizing selection: favors survival of individuals w/ intermediate phenotypes. Example: bottleneck effect occurs when the I Evolved population population is dramatically reduced founder effect is when a subset of individuals establish a new population Original population Gene flow: movement of genes into or out of a population. Directional selection: favors individuals at one extreme of phenotype range Speciation: formation of 2 species. from an anscestral species Disruptive selection: 2 or more extreme phenotypes are favored M
