Biology 1114 Week 9
Biology 1114 Week 9 BIOLOGY 1114 - 0010
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This 2 page Class Notes was uploaded by Sean Bhatnagar on Sunday October 25, 2015. The Class Notes belongs to BIOLOGY 1114 - 0010 at Ohio State University taught by Staff in Fall 2015. Since its upload, it has received 18 views. For similar materials see Biological Sciences: Form, Function, Diversity, and Ecology in Biology at Ohio State University.
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Date Created: 10/25/15
Biology Week 9 For speciation to happen 2 populations of the same species must be isolated in some way Why Gene ow between them would slow this downkeep it from happening They need to be isolated to Which will havehigher heterozygosity 1 A population wieht 2 alleles in equal proportion or 2 Three alleses in hardy Weinberg equilibrium 3 alleles Hardy Weinberg HAS nothing to do with it It doesn39t matter Assuming equal proportions heterozygosity will most of the time be higher Same question except if they are NOT in hardy Weinberg equilibrium 3 alleles Speciation The mechanisms by which populations attain reproductive isolation Commonalities of all species concepts 0 Species are populations linked by history Characterized by shared derived attributes Genetic and morphological continuity Isolating mechanisms Phenomena that prevent gene ow between populations or members of the same population Prezygotic barriers Prevent mating between populations 0 May outright prevent or just decrease the frequency or incidence of mating Positive Assortive mating o Nonrandom mating based on genotype or phenotype Reproductive lsolations Physical barriers between populations are not enough 0 Biologically based reproductive barriers accompany speciation Premating barriers Before mating Features that impede transfer of gametes to members of other species Lack of ContactTime Temporal isolation o Mate at different time of year or day Ex Trout Brown trout mate in the fall and rainbow trout breed in the spring 0 Habitat Isoations 0 Spend whole life in a single place or on a single host and so don39t get a chance to meet Ex Mosquitoes They breed in different habitats
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