bio94+review+++2 - Chapter 25 Forces of evolution Please...

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Chapter 25 Forces of evolution: Please write down the four main mechanisms that causes evolution are natural selection Please write down the 4 patterns of natural selections Two advantages that heterozygotes have over homozygotes Making sure that you understood the math problem I solved in section last week. Get familiar with the formula. HIV—CCR5 CCR5 is a surface protein receptor that is attractive to certain chemokines. It is also the gateway for HIV virus to use in order to infect the hosts. Mutation on del 32 introduce the resistance to HIV infection. Please think about the 3 questions professor list out in the lecture slides. Draw out the cartoon for directional, stabilizing and disruptive seletions. And please give an example for each. ( from the textbook, making sure that you know one example for each pattern) Genetic drift, mutation , migration and inbreeding Genetic drift—defined as any change in allele frequencies in a population that is due to chance. It is more pronounced in small population than large populations.
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