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Unformatted text preview: migration - increases variation witin and decrease varition amond pop. (genetic) Fitness: relative survival over others-selection acts through teh phentype-survivl and reproduction of one phenotype (genotype) relative to others in the population - often environmentally dependant phenotype distribution F over human height bell curve from short to tall genetic variation environmental varitaion these two interact to give rise of variation in pop. Selection: directional selection - will shift the curve towards the more advantageous (favored) genotype stabilizing selection - results when both extremes are less advantageous and it thins up tyeh curve, teh next generation goes back to normal. no real cange ( no real evolution) maintain variation in population other possibility is where teh ones in teh middle are disadvantageous (disruptive) after selection (many of teh middle ind are taken out and can cause speciation)...
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This note was uploaded on 05/10/2010 for the course BIO 1B taught by Professor Carlson,mischel,power during the Spring '07 term at Berkeley.
- Spring '07