BIOS 101 Lecture Notes - Lecture 76: Frequency-Dependent Selection, Peppered Moth Evolution, Motoo Kimura
Document Summary
Changes in finch beak depths to adapt to eat different types of seeds. Nature is a complex dynamical system, product of natural selection. Can transform lineage dramatically over time, or appear to remain the same (stasis) On the origin of species- darwin assumed macro would result from micro. Ernst mayer- 100 years later develop a scientific theory of speciation. Population is smallest unit where evolutionary change is possible. Individuals do not evolve, population and species do. Population genetics: refers to the study of evolution via the observation and modeling of allele frequencies and genetic change in populations of organisms. Hardy-weinberg equilibrium- links allele frequencies to genotype frequency when no evolution is occuring. 1: no allele flow, no mutation, random mating, no selection. Deviations can reveal genetic drift, mutation, non-random mating, allele flow (rest of notes on printed out powerpoint) Genetic drift- change in allele frequencies due to chance events (similar to sampling error)
