ANTH 110 Chapter Notes - Chapter 3: Adaptation, Lichen, Reproductive Isolation
Document Summary
Natural selection: the outcome of processes that affect the frequencies of traits in a particular environment. Traits that enhance survival and reproductive success increase in frequency over time: 3 conditions/principles: Variation: every species is composed of a great variety of individuals- some better adapted than others. Heritability: offspring inherit traits form their parents, at least to some degree in some way. Differential reproductive success: because better-adapted individuals generally produce more offspring over the generations than that of poorer-adapted individuals, the frequency of adaptive traits increases in the subsequent generations. A new species emerges when changes in traits or geographic barriers result in the reproductive isolation of the population: adaptive: cultural traits that enhance the survival and reproductive success in a particular environment. Maladaptive traits will generally decline or disappear. Such as neutral traits: traits that do not seem to confer any advantages or.
