INTEGBI 35AC Lecture Notes - Sexual Selection, Mutation, Myoglobin
23 Oct 2013
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Evolution: changes in allele frequencies over time. 4 forces of evolution: mutation (only source of new variation, selection (acts to diverge populations directionally, drift (act to diverge populations randomly, migration (acts like genetic glue) Epidemiology: the science of disease occurrence and transmission. Human babies drink mama"s milk for the first 6 months: babies drink milk but adults don"t. Basic primitive condition: adult mammals are lactose intolerant. This is because there needs to be a point where the babies stop drinking their mothers milk. Lactase: enzyme that digests lactose into usable parts. Lactose intolerant: normal for humans but the derived trait is lactase persistent: aka: mutated allele (lactase persistent (+)) lactose tolerant. All babies are this: vs normal allele (lactase (-)) lactose intolerant. Body can"t digest milk and the bacteria digests it instead. Ex: asians, blacks, native americans high % of people are lactose intolerant. Don"t wana mate with someone who can drink milk.
