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Download BrainPop: Darwin and Natural Selection 1831 Charles Darwin
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BrainPop: Darwin and Natural Selection 1831 Charles Darwin sailed on the HMS Beagle for 5 years, visited Galapagos Islands (west coast of S. America) Discovered unique species of finches, mockingbirds, tortoises and other animals on each island Unique traits to match the unique environments on the islands Determined that they must have all developed from a common ancestor *There is always competition for resources which creates environmental pressures *Variations (differences) in populations *Caused by mutations (mistakes when DNA is copied) which can sometimes be passed on to offspring *Can be good (help the organisms survive) *bad (hurt chances of survival) *neutral (no effect on survival) “survival of the fittest” Takes millions of years All life is connected Lamarck – before Darwin, traits obtained during an organism’s lifetime could be passed on to the next generation Darwin’s Theory of Natural Selection disproves Lamarck On the Origin of Species… published in 1859 Reproduction Selection Variation Struggle to survive
