b112_Lecture_23

b112_Lecture_23 - IOL 112 hapter 23 BIOL 112 Chapter 23 The...

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Unformatted text preview: IOL 112 hapter 23 BIOL 112 Chapter 23 The Evolution of Populations e Neo ‐ arwinian Synthesis The Neo Darwinian Synthesis • arwin’s Theory lacked a mechanism Darwin s Theory lacked a mechanism. • Modern genetics has supplied a mechanism. • If Darwin had read and accepted Mendel, he would likely have discovered the mechanism himself. apers of the Synthesis Shapers of the Synthesis Theodosius Ernst Mayer (R) George Gaylord G. Ledyard Dobzhansky Taxonomist Simpson Stebbins Geneticist Paleontologist Botanist enes, Populations, Species Genes, Populations, Species • population is a local group of individuals A population is a local group of individuals from the same species. • species is a group of populations that can A species is a group of populations that can potentially interbreed and produce fertile offspring in nature. • The gene pool, populations and species are the raw material of evolution. pulation Genetic Structure Population Genetic Structure • description of the frequencies of alleles is one A description of the frequencies of alleles is one descriptor of genetic structure. • Other descriptors include heterozygosity and the frequency of polymorphic loci. • Population genetic structure can be used to understand breeding systems and evolutionary processes. etermining Allele Frequency Determining Allele Frequency • a population of 1,000, there are: In a population of 1,000, there are: – 200 AA , 700 Aa and 100 aa – Total number of alleles is 2,000 • Number of A alleles = 700 + (2 X 200) = 1,100. • Freq of A = 1,100/2,000 = 0.55. • Number of a alleles = 700 + (2 X 100) = 900. • eq of llele = 900/1,000 = .45 Freq of a allele 900/1,000 0.45. ardy ‐ einberg Theorem Hardy Weinberg Theorem • redicts that allele frequencies will remain Predicts that allele frequencies will remain unchanged each generation if the following assumptions are met:...
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This note was uploaded on 06/18/2009 for the course BIOL- 112 taught by Professor Bryanness during the Fall '09 term at Pacific Union.

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b112_Lecture_23 - IOL 112 hapter 23 BIOL 112 Chapter 23 The...

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