BI 132 Lecture Notes - Lecture 2: Beewolf, Sensory System, Mutation
1 Nov 2018
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Bi 132 lecture 2 natural selection. Science as a process: a scientist"s work must be verified by other work, scientists tend to be careful about pronouncements, scientists must be always willing to revise what they know. Evolution: change in frequency of traits (or genes) in a population over time, fitness = reproductive success. Adaptation: characteristic that confers higher fitness; trait maintained as a result of natural selection, when we study behavior as an adaption, we try to understand its function and how it might have evolved (ultimate perspective) Mechanisms for evolutionary change: natural selection darwin: variation, heredity, differential reproduction, some individuals produce more surviving offspring during their lifetime than others due to differences in anatomy, physiology, or behavior. 2: they are naturally selected, genes that help make individuals ore reproductively successful will become more common in the population over evolutionary time. Some selective pressures: predators, competitors, food, climate, physical environment, reproduction, social interactions, disease.
