BIOL 1F90 Lecture 14: BIOL 1F90 lecture 14 winter 2016
25 Feb 2016
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Less common in mature because they are more costly in terms of energy and resources used. Underlying cause of speciation is the accumulation of genetic changes that ultimately promote enough di erences so that we judge a population to constitute a unique species. Single species transformed into a di erent species over the course of many generations (clams) Division of a species into two or more species. Clade is a group of biological taxon (or species) that includes all descendants of one common ancestor ( nches) Occurs when some members of a species become geographically separated. Can also occur when a small population moves to a new location that is geographically. Genetic drift and natural selection may quickly lead to di erences. Adaptive radiation: single species evolved into array of descendants that di er greatly in habitat, form or behaviour. Two di erent populations may interbreed at hybrid zones.
