Lecture 2 Biology 2

Lecture 2 Biology 2 - Evolution and Systematics I Chapter...

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Evolution and Systematics I Chapter 25 (except 25.4) I. Review of evolution and selection II. Introduction to phylogenies III. Fossils IV. Classification Review of Evolution evolution = Modern organisms differ from recent fossil organisms Æ Pathogens change from antibiotic susceptible to antibiotic resistant Æ Species have gone extinct in our lifetimes http://www.nearingzero.net/screen_res/nz149.jpg http://www.mc.maricopa.edu/dept/d10/asb/anthro2003/origins /hominid_journey/timeline.html Evolution Natural Selection Æ A description of the fact that species and their characteristics change over time Æ A theory that provides hypotheses about why and how these changes have occurred EVOLUTION NATURAL SELECTION
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1.Individuals within species vary. 2.Some of these variations are heritable. 3.More offspring are produced than can survive. 4.Variations can influence the likelihood of survival and reproduction. The Key Ingredients of Natural Selection
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Lecture 2 Biology 2 - Evolution and Systematics I Chapter...

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