Species and speciation lecture

Species and - Georgia Tech School of Biology Speciation What is a species Species concepts We've grown apart Reproductive Isolation Modes of

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Biology 1510 Georgia Tech School of Biology Fall 2008 Speciation What is a species? Species concepts We’ve grown apart: Reproductive Isolation Modes of speciation Patterns of Speciation
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Biology 1510 Georgia Tech School of Biology Fall 2008 Calculating Allele Frequencies p 2 = 0.30, 2pq = 0.50, q 2 = 0.20 N AA = 60, N Aa = 100, N aa = 40
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Biology 1510 Georgia Tech School of Biology Fall 2008 The frequency of two alleles in a gene pool is 0.1 (A) and 0.9 (a). Assuming Hardy-Weinberg equilibrium, what is the percentage in the population of heterozygous individuals and homozygous recessives? A) 18% heterozygous individuals, 81% homozygous individuals B) 25% heterozygous individuals, 74% homozygous individuals C) 33% heterozygous individuals, 66% homozygous individuals D) 44% heterozygous individuals, 55% homozygous individuals
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Biology 1510 Georgia Tech School of Biology Fall 2008 Assumptions The five conditions for nonevolving populations are rarely met in nature: No mutations Random mating No natural selection Extremely large population size No gene flow
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Biology 1510 Georgia Tech School of Biology Fall 2008 What is a species?
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Biology 1510 Georgia Tech School of Biology Fall 2008 What is a species? - a group of individuals that actually or potentially interbreed in nature Biological Species Concept (Mayer 1942) Problems …… - Many species reproduce asexually - Many species can produce hybrids - How to you determine whether or not species actually interbreed? - How do you classify the potential to interbreed?
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Biology 1510 Georgia Tech School of Biology Fall 2008 Dealing with hybrids Hooded crow Carion crow TWO SPECIES OR SUBSPECIES???
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Biology 1510 Georgia Tech School of Biology Fall 2008 The verdict is… In 2002 the Hooded and Carion crows were elevated to species status - hybrids were found to have reduced fitness compared to non-hybrids - hybrids were found to occur less frequently than expected in the population Hooded crow ( Corvus cornix ) Carion crow ( Corvus corone )
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Biology 1510 Georgia Tech School of Biology Fall 2008 Speciation is a gradual process regardless of definition some ambiguity will still persist
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Biology 1510 Georgia Tech School of Biology Fall 2008 What is your goal? - classify organisms systematically
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This note was uploaded on 09/04/2009 for the course BIO 1510 taught by Professor Unknown during the Spring '07 term at Georgia Institute of Technology.

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Species and - Georgia Tech School of Biology Speciation What is a species Species concepts We've grown apart Reproductive Isolation Modes of

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