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Ant 1 april 22 2008

Ant 1 april 22 2008 - Primate origins Genetic evidence...

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Primate origins  Genetic evidence - Genotype + environment   phenotype (where  selection actually act upon) - Introns do not code for proteins, are neutral - Mutations accumulate in introns with no effect on  fitness (ie, harmless) - Assuming mutations occur at constant rate  Molecular clock - Few mutations difference = closely related - More mutations difference = more distantly related Putting things in perspective - Time: the geological time scale - Space: movement of the continents  - Weather: climate changes - Chance: randomness and fossil record  Continental drift - Continents have rearranged themselves considerably  over last 250 MYA - Morphological data suggest that south American  primates came from Africa - South America and Africa were separated by 3000 km  (2000 mile) - Vegetation rafts from mangroves? Climate changes  - Recent cooling and drying trend in global climate  starting about 15 mya - Sea level changes in SE Asia  o Lots of opportunities for 
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