APchapter23notes - C hapte 23 Note r s TheEvolution of...

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    Chapter 23 Notes The Evolution of Populations
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    Concept 23.1 Darwin and Mendel were contemporaries  of the 19 th  century - at the time both were unappreciated  for their work
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    Concept 23.1 The turning point for evolutionary theory  was the development of  population  genetics - emphasizes genetic variation and  recognizes the importance of  quantitative characters
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    Concept 23.1 A population’s gene pool is defined by its  allele frequencies Population : a localized group of  individuals belonging to the same  species Species : individuals that have the  potential to interbreed and produce  fertile offspring in nature
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    Concept 23.1 The total aggregate of genes in a  population at any one time is called the  population’s  gene pool - all the alleles of a gene of all the  individuals in a population
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    Concept 23.1 Example of allele frequency - population is 500 plants - 20 are white (rr) - 320 are red (RR), 160 are red (Rr) Allele frequency is .8 or 80% - 320 X 2 (for RR) = 640 + 160 (for Rr) ;  800/1000 = .8
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    Concept 23.1 The Hardy-Weinberg theorem describes a  nonevolving population - the frequencies of alleles and  genotypes in a population’s gene pool  remain constant unless acted upon by   outside factors - the shuffling of alleles has no effect on  a population’s gene pool
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    Concept 23.1
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APchapter23notes - C hapte 23 Note r s TheEvolution of...

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