How Does Evolution Happen Ch.5, Sec.2. Charles Darwin.

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Presentation transcript:

How Does Evolution Happen Ch.5, Sec.2

Charles Darwin

Naturalist on HMS Beagle Naturalist on HMS Beagle Collected plant/animal specimens Collected plant/animal specimens Traveled to Galapagos Islands Traveled to Galapagos Islands

He noticed animals/plants on Galapagos similar but not identical to mainland species He noticed animals/plants on Galapagos similar but not identical to mainland species Main species observed were finches Main species observed were finches

Finches Different from mainland Different from mainland Different from others on island Different from others on island Mainly shape of the beak Mainly shape of the beak

Question Why were the finches on the island similar, but not identical to the ones on the mainland? Why were the finches on the island similar, but not identical to the ones on the mainland?

Thomas Malthus Humans have the potential to reproduce beyond food supplies Humans have the potential to reproduce beyond food supplies

Darwin noticed… Species produce more offspring than can survive Limited # survive and reproduce Why? ADAPTED

Natural Selection Process by which evolution may occur Process by which evolution may occur

STEPS OF NATURAL SELECTION

1) Overproduction Species produce more offspring than will survive Ex. - frogs

2) Genetic Variation Individuals are slightly diff. from each other Some are better adapted

3) Struggle to Survive Competition for resources Some better adapted to obtain resources

4) Successful Reproduction Well adapted = survival = reproduction Well adapted = survival = reproduction Species continues Species continues