03_NaturalSelection - Evolution by Natural ! (and articial)...

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Evolution by Natural (and artifcial) Selection Di Stilio- lecture 3- 3/30/11
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Artifcial Selection: Human-driven evolution http://www.wsdot.wa.gov/environment/biology/usfw-list/images/wolf.jpg Canis lupus (gray wolf) Canis lupus familiaris (dog)
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Artifcial Selection: Crop domestication Brassica oleraceae
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What observations was Darwin trying to explain? (review) Why are geographically adjacent species generally similar in appearance, yet distinct from each other when examined in detail? Why are homologous structures found in organs having very different functions? Why do extinct species often resemble extant species? How do species acquire the traits that adapt them to their environment? How do species change through time?
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Medium seeds Insects, nectar Small seeds Darwin’s Finches Large seeds
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Darwin’s postulates (testable!) 1. Among individuals of a species, there is variation in phenotypic traits.
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03_NaturalSelection - Evolution by Natural ! (and articial)...

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