1. How Does Evolution Happen Ch.5, Sec.2

2. Charles Darwin

3. 1831 1831 Naturalist on HMS Beagle Naturalist on HMS Beagle Collected plant/animal specimens Collected plant/animal specimens Traveled to Galapagos Islands Traveled to Galapagos Islands

6. 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

7. 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

10. 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?

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

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

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

14. STEPS OF NATURAL SELECTION

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

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

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

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