BIOL 121 Lecture Notes - Lecture 25: Mutation, Selective Breeding, Brassica Oleracea
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Principle by which each slight variation [of a trait], if useful, is preserved . Conclusion 1: struggle for existence leads to differential survival and reproduction. Conclusion 2: natural selection causes change in populations. This leads to increase in frequency of better performing phenotypes. Will undergo natural selection if have 3 differences in survival reproductions. Population changes : variation, heritable (like baby deer know to lay low in grass when mother leaves, leads evolves. Adaptation is either the beginning of evolution, or end of. Adaptation is only when a whole population changes due to variation. Natural selection causes change even if there is no competition. Artificial selection: done by humans like plants (vegetables bred from brassica oleracea) or pets. Acclimation occurs when an individual changes in response to changes in the environment. There just needs to be a difference in reproductive success between variants. Homology: shared features inherited from a common ancestor.
