Popular in Anthropology
Popular in ANTH
This 2 page One Day of Notes was uploaded by Emily Notetaker on Tuesday September 23, 2014. The One Day of Notes belongs to 1001 at Louisiana State University taught by a professor in Fall. Since its upload, it has received 81 views. For similar materials see Anthropology in ANTH at Louisiana State University.
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Date Created: 09/23/14
Anthro 9232014 Force of Evolution Allele variability Within a pop Between pops Mutation f f pops dissimilar from one another Gene flOW pops similar to one another Genetic drift 1 1a Natural selection 1 1a Natural Selection 0 Unit of natural selection individual organism is affected by natural selection 0 Unit of evolution the population is affected by evolution as a whole from individuals experiencing natural selection 0 The ability of natural selection to cause allele frequency changes is directly related to the heritability of traits o Heritability index G P 0 Adaptation is the end result of natural selection 0 Adaptation the increases in frequency of traits in a population that allowed the individual organism to survive or meet with environmental stresses 0 Natural selection is opportunistic that is natural selection acts on the phenotypic and genetic variability in a population That exists in a population Therefore different pops in a species may show different adaptations to the same environmental stress Fundamental Theorem of Natural selection the opportunity of natural selection is directly related to the genetic variation in a population or species Theories on the origin of species species A B C D Species 1 B C D Species 2 A 0 Gradualism directional speciation a consideration that evolution is a continuous process and that natural selection is the principle force of evolution in speciation o Population A become geographically isolated from populations B D and there is no gene ow between population A and population B D o Gene pools diverge from one another principally by natural selection o Population A becomes reproductively isolated from population B D and a new species has emerged 0 Punctuated Equilibrium evolution is a discontinuous process Evolution involves periods of rapid speciation followed by long periods of evolutionary stasis no meaningful evolutionary change in species 0 A small population A becomes geographically isolated from larger populations B D o Gene pools diverge from one another principally by mutation and genetic drift o Population A becomes reproductively isolated from populations B D and a new species has emerged o Natural selection is not very important Gaps in the fossil record explained by o Gradualism by the vagaries of fossilization If we had a complete fossil record we would see a linear relationship among species 0 Punctuated equilibrium long periods of evolution stasis then a short burst of evolution change leading to a new species The gaps in the fossil record to a punctuated equilibrist represent data about the tempo of evolution