Individuals are selected…. Individuals survive or don’t survive…. Populations evolve!. Individuals DON’T evolve…. Populations Evolve!. Natural selection acts on individuals differential survival “survival of the fittest” differential reproductive success who bears more offspring
Individuals are selected…
Individuals survive or don’t survive…
Decreased number of target sitesChanges in Populations
Pocket Mice in desert lava flows
Bent Grass on toxic mine site
Body size & egg laying in water striders
Beak depth of
Medium ground finch
Mean beak depth of parents (mm)Where does variation come from?
Are we moving towards a blended world?
EC – 28; October 2010 Scientific American
Ground finches3. Genetic Drift
Journey of Man
Eyes of Nye—Race!
Likely migration paths of humans out of Africa
Many patterns of human traits reflect this migration!
Breeding programs must consciously outcross
Golden Lion Tamarin
Survival doesn’t matterif you don’t reproduce!Sexual Selection
Is there a testablehypothesis in there?Sexual Selection
HOT STUFF!Some fish had thevariation of producinganti-freeze proteinsPhysiological Selection
5.5 myaThe Antarctic Ocean freezes over