Anthro 7 Notes

Anthro 7 Notes - Anthro 7 Notes January 7th, 2009: Lecture...

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Anthro 7 Notes January 7     th    , 2009: Lecture 2 Evolution by Natural Selection     Organisms are well adapted: monarch butterfly o Lay eggs on milkweed plants o Caterpillars feed only on milkweed o Milkweed contains toxic chemicals o Larvae store toxins in body Because the monarchs store toxins in their bodies, it makes monarchs unpalatable  and birds learn to avoid them. Complexity: o The human eye: Iris regulates light entry Lens projects focused image on retina Light sensitive retinal cells convert image to nerve impulses re color  and intensity Optic nerve carries information to the brain Brain interprets the image Differences in complexity between eye and grand canyon: Eye: parts must be put together in just the right way for eye to function as  device for seeing. Improbable that parts came together by chance. Through  natural selection which does not operate with a goal, and is done through  small incremental steps, not big leaps. Grand Canyon: there can be many different conformations and combinations  of elements. Many similar kinds of canyons in other parts of the southwest. Telescope: telescopes are the product of foresight and planning by inventor  with specific goal in mind. Innovations are directed, novel features can be  created. Complex design in nature implies adaptation
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Complicated Improbable Well suited to solve particular environmental problem Most people thought design was product of divine designer –William Paley Charles Darwin challenged conventional view Son of upper class English doctor Medical school dropout, divinity student Avid naturalist and collector Member of natural history set at Cambridge Darwin was recommended for position of ship’s naturalist HMS Beagle with Fitzroy: goal to chart the coast This voyage gave him time to go ashore and collect many types of animals  and insects…. . Made extensive collection of plants, animals Kept a detailed journal of his research and ideas Darwin was deeply affected by the diversity of life he encountered. The HMS Beagle visits the Gallapagos islands where Darwin encounters  birds (finches). He notices that they have different sized beaks used for  different types of feeding….idea of modification from a previous  species….begins to pioneer the idea of natural selection. Returned to England 1836
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This note was uploaded on 03/14/2009 for the course ANTHRO 7 taught by Professor Manson during the Winter '98 term at UCLA.

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Anthro 7 Notes - Anthro 7 Notes January 7th, 2009: Lecture...

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