BIOL 1102 Lecture Notes - Lecture 24: Evolutionary Arms Race, Allele Frequency, Genotype Frequency
Document Summary
Can be good in one place, bad in another. Evolutionary arms race: ex: predator-prey, flower-pollinator, host-parasite, adaptive radiation, one species evolves into many species in a short time period, examples: hawaiian honeycreepers, galapagos finches, north. Much less genetic variation than in the original population: effective population size (ne, the average number of individuals in a population that contributes genes equally to the next generation. New alleles are worse and selected against: balancing selection (stabilizing or disruptive selection at the level of. If the neutral mutation rate is constant, populations should accumulate fixed neutral differences (divergence) at a constant rate per-generation. That rate can be estimated and used to estimate the divergence time between different species. For example, the cyst-b gene evolves at about 2% sequences divergence per million years in small birds: epigenetics, variation in organisms that is not controlled by differences in dna sequences.
