Definition of Evolution the process by which species arise and change over time. The idea that all organisms have descended from common ancestors.
Natural Selection The unequal survival and reproduction of organisms due to environmental forces, resulting in the preservation of favorable adaptations.
Sexual Selection. Evolutionary Mechanisms Genetic Drift Migration Mutations Natural Selection Non-adaptive Adaptive.
Natural Selection the process whereby organisms better adapted to their environment tend to survive and produce more offspring It is a two step process:
BIOE 109 Summer 2009 Lecture 9- Part I Sexual selection.
Sexual Selection & Mating systems I. Sexual selection overview A. Hypothesis B. Mechanisms C. Natural Selection v. Sexual Selection D. Males more affected.
EEOB 400: Lecture 9 Sexual selection. Sexual dimorphism.
Evidence of Evolution. Voyage of the Beagle Charles Darwin’s observations on a voyage around the world led to new ideas about species.
Evidences of Evolution. Fossils zThere are millions of different life forms on earth that have evolved over time. zSome clues to the type and structure.
Population Genetics The Study of how Populations change over time.
Animal Behavior Biology 17. Why Study Animal Behavior???