microevolution%20students%20s08

microevolution%20students%20s08 - Microevolution and modes...

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1 For evolution to occur, we need: + Variation in heritable traits come from: Gene expression Specific gene “makes” specific protein. In this case, a “gray coat” protein Chromosome DNA strand Gene Microevolution and modes of selection and/or Remember from earlier in the semester… What is Microevolution? • e.g., population with 80% G alleles Æ 50% G alleles • Changes in a gene pool GG GG GG GG GG GG GG GG gg gg GG GG GG GG GG gg gg gg gg gg MICROEVOLUTION For horse coat color, there are two alleles, Gray (G) and Chestnut (g) •W e see changes in traits- phenotypes and natural selection acts on phenotypes. • But keep in mind: evolutionary change requires change in genotypes A population evolves when individuals with different genotypes survive and reproduce at different rates So, you see a change in gene frequency A change in gene frequency over time means that the population has evolved. The big question -- How did it happen? GG GG GG GG GG GG GG GG gg gg GG GG GG GG GG gg gg gg gg gg
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2 Mechanisms of microevolution • Any combination might be responsible for
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microevolution%20students%20s08 - Microevolution and modes...

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