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This 2 page One Day of Notes was uploaded by Emily Notetaker on Friday September 19, 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 82 views. For similar materials see Anthropology in ANTH at Louisiana State University.
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Date Created: 09/19/14
Ahthro 9182014 Origin of Species Species A B C D 0 Speciation results when one population in a species can no longer inbreed with other populations 0 This reporidcutive isolation occurs when one population A becomes geographically isolated from the other populations 0 Subsequent to this isolation there is a build up of gene pool differences between population A and populations B D If the gene pool differences are suffiecient to prevent interbreeding between population A and populations B D then a new species has originated 0 Geographical isolation of a population is important in speciation This isolation prevents gene ow Genetic Drift change in allele frequencies in a population or species due to random factors Formula for estimating the magnitude of allele frequency changes by genetic drift 5J39 Io q2N 8 expected rnage of allele frequency change by genetic drift pq frequencies of two alleles of a gene N population size There is an inverse relationship between population size and potential evolution by genetic drift All populations evolve every generation by genetic drift but the magnitufe of evolution by genetic drift is greater in a smaller population then in a larger population In each generation every gene is subject to evolution by genetic drift and the magnitude of evolution by genetic drift for one gene is independent from the magnitude of other genes For a particular gene genetic drift continues until one allele becomes fixed and all other alleles for that gene are lost from that population Fixation where the frequency of one allele becomes 100 and all over alleles for that gene are lost from the population Genetic drift decreases the allele variability within a population but increases the allele variation between populations Founder effect change in allele frequency in a population due to a sudden production in population size Natural selection differential reproductive success among individuals in a population or species Individuals differ in the numbers of their children 0 Fitness relative reproductive success 0 The individual organism is the unit of natural selection where as the population is the until of evolution
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