ANTH 2 Lecture Notes - Lecture 3: Uracil, Point Mutation, Ob River
6 Aug 2020
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3 observations and 2 deductions leading to his theory of natural selection: differential reproductive success (rs: ob. 1: all organisms have the capacity for tremendous population growth: ob 2: we don"t see the evidence of these capacities; some don"t survive or are never born, are eaten, etc, ob 3: nature is full of variation. No 2 organisms from the same parents are exactly alike unless they are identical twins. A higher proportion of those with favorable traits will survive (duh) Pre-reqs for natural selection to occur: mode of inheritance, genetic variability. If ever organism is a clone of the other there will be no change: environmental pressure favoring one trait over another. Genotype: genetic makeup, unchanged from conception to death. Phenotype: physical makeup, varies throughout life, organisms appearance: natural selection operates on the phenotype, evolution operates on the population of a species. Adaptation: any trait that confers enhanced rs (fitness)
