directions: title pg. 97 “evolution of populations” divide your page 97 into 10 different boxes
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Directions: Title pg. 97 “Evolution of Populations” Divide your page 97 into 10 different boxes. Number the boxes 1-10. Evolution of Populations. #1. Population - group of organisms of the same species that interbreed. #2. Gene Poo l- - PowerPoint PPT PresentationTRANSCRIPT
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• Directions: • Title pg. 97 “Evolution of Populations”• Divide your page 97 into 10 different boxes. • Number the boxes 1-10
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Evolution of Populations
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Population- group of organisms of the same species that interbreed
#1
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Gene Pool-all the genes (alleles) present within a population
#2
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Important!
• Natural selection works on the phenotype, not the genotype!
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Allele Frequency (Relative)- the number of times an allele will appear in a gene pool
Total- 6
R- 3 50%
r- 3 50%
rR RR
r r
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#4R- 48r- 52
What are the allele
frequencies? “R” has an allele frequency of 48%“r” has an allele
frequency of 52%
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What can introduce variation into a population? 1)Mutation2)Gene Shuffling from Independent
Assortment
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Genetic Variation is important! Why?! -enables greater survival in a changing environment
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Genetic Equilibrium- -When allele frequencies remain the same.-No change, no evolution
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Genetic Equilibrium Requirements1)Random mating2) Large population3) No immigration or emigration4)No mutations5) No natural selection
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Genetic Drift-Random change in allele frequency due to small populationsNo benefit nor harm
#9
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How does Genetic Drift occur?1)Bottleneck Effect: only a few survivors from an original population
contribute their alleles
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2) Founder Effect:A subgroup of the population immigrates to and colonizes a new area, changing allele frequencies.
#10
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Types of Evolution:
Adaptive RadiationOne species can evolve into many diverse forms
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