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Evolution of Populations
AP Biology Chapter 23 Evolution of Populations
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Variation Exists
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Variation Exists
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Variation in Crossover
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Variation in Anaphase I
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Variation in Anaphase II
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Variation in Egg and sperm (Which sperm will it be?)
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Genetic Drift “Random change”
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Evolution of Allele frequency
CRCR CRCR CWCW CRCR CRCR CRCW Only 5 of 10 plants leave offspring CRCW Only 2 of 10 plants leave offspring CRCR CRCR CWCW CRCR CRCR CWCW CRCR CRCR CRCW CRCW CRCR CRCR CRCR CRCW CWCW CRCR CRCR CRCR CRCW CRCW CRCW CRCR CRCR Generation 1 p (frequency of CR) = 0.7 q (frequency of CW) = 0.3 Generation 2 p = 0.5 q = 0.5 Generation 3 p = 1.0 q = 0.0
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Genetic Drift – Bottleneck effect
Original population Bottlenecking event Surviving population
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“Founding fathers”
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“Founding fathers”
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“Founding fathers”
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Gene Flow (Movement on purpose)
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Gene Flow (Movement on purpose)
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