EBIO 1220 Study Guide - Comprehensive Midterm Guide: Mahi-Mahi, Genetic Drift, Lactase Persistence
7 Feb 2017
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Learning goal: describe how natural selection and genetic drift lead to evolutionary change: the darwinian revolution, descent with modification. Mechanisms of evolution: natural selection, genetic drift. Nothing in biology makes sense except in the light of evolution - theodosius. Evolution: change in the genetic composition of a species over time, such that species alive today are the descendants of ancestral species. The earth is young (1000"s of years old) The environment is unchanging (canyons, mountains, continents, etc. ) Species do not change; all species have remained the same since creation (aristotle) There is no such thing as a new species. Closely related to each other and to mainland species. All of these birds were related and probably traced back to a common ancestor, but as time went on birds adapted to the local conditions of the island they live and and eventually turned into different species. Their beaks were suited to the availability of particular foods.
