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lecture_16

lecture_16 - molecular basis of an adaptive trait oral...

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molecular basis of an adaptive trait: Foral anthocyanin production in Aquilegia
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evolutionary change
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evolutionary change genetic drift – allele frequencies change randomly due to neutral population dynamics adaptation – allele frequencies change non-randomly due to Ftness differences
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adaptive evolutionary change adaptive trait – particular phenotype that confers a Ftness advantage causative mutations – genetic basis for trait differences
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adaptive evolutionary change Why are some individuals of A. coerulea blue-Fowered, while others are white-Fowered?
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fower color – Ftness consequences bumblebee hummingbird hawkmoth
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fower color – Ftness consequences pollinators have color pre±erences pollinators vary in their effectiveness in moving outcrossed pollen inbreeding depression is high in columbines
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fower color – genetic basis anthocyanin biosynthetic pathway gene (DNA) --> transcript (mRNA) --> phenotype (protein) gene expression and gene function
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