BIOL 202 Lecture Notes - Lecture 3: Intraspecific Competition, Adaptation, Adaptive Radiation
Document Summary
French zoologist, one of first to seriously challenge idea that species are. The origin of species by means of natural selection (1859) A change in the normal form of an organism over the course of generations. Morphology = physical characteristics/appearance and structure of an organisms externally or internally. The evolutionary history of a group or lineage. Lineage = group composed of species, taxa, or individuals related by descent from a common ancestor. Darwin argues that species on earth today are the descendants, the modified descendants, of other species existing earlier in time. Evolution: change/modification in the normal form of an organism over the course of generations. Evolutionary modifications in form can be so substantial that new species can appear in time. Adaptation = adaptive trait: a morphological, physiological or behavioral trait or feature that enhances an organism"s ability to survive and reproduce in its given environment. Fit (as in fit to one"s environment ): having morph. , physio. , or behav.
