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11 Jan 2012
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Anta01 - lecture 3 y what is evolution & natural selection working on: genetics (dna). y positive traits allow species to be successful and passed on. New traits are passed by mutation, genetic flow, and genetic drift. Know these 3 terms*. y genotype: just the recipe. y phenotype: what we can see about you and what is expressed. Example: tattoo, piercings. y changes in genes on an individual basis. y actual transition or physical change happens only with mutation. But population changes through genetic flow and genetic drift*. y sickle cell anemia as recessive is neutral in places with malaria. y same alleles in small population so they are in-bred. Example: tiny eyes. y genetic drift: they separate and do not come back together. They do their own way as different species. y genetic drift causes/promotes speciation. Two groups are going to be two species even if they were one. Allows a single species to continue as one.

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