BIO 200 Lecture Notes - Lecture 4: Hyracotherium, Megatherium, Tetrapod
23 Sep 2016
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Darwin"s evidence: darwin"s hypothesis of natural selection, evidence for darwin"s hypothesis from his lifetime, modern evidence. Implications for darwin"s hypothesis: evidence to support the implications. Key terms/concepts: three factors necessary for natural selection. There must be variation in the population. Variation must lead to difference among individuals in lifetime reproductive success. Variation must be transmitted to the next generation: five factors necessary for natural selection. Populations tend to over breed relative to available resources, leading to struggle for survival. Better variations have better survival (survival of the fittest) Traits leading to better survival and reproduction must be heritable: explain evidence that individuals vary. Different kinds of snails color, shapes, size, etc. Humans vary: explain evidence that organisms overbreed given available resources. Oak seedlings 0. 01 - 0. 1% survive to adulthood. 10,000 acorns = 1 - 10 oaks. There just isn"t enough room for thousands of trees to sprout: the grants" work on the medium ground finch.
