BIO120H1 : Coyne Book
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BIO120H1 Full Course Notes
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Document Summary
Life on earth evolved gradually beginning with one primitive species that then branched out over time, throwing off many new and diverse species. The mechanism for most but not all of evolutionary change is natural selection. 6 parts to this: evolution species undergoes genetic change over time. Differences based on change in dna: gradualism takes many generations to make a substantial change, common ancestry recent ancestor similar trait, which creates natural classification this is strong proof for evolution. Theory of evolution ---documented set of principles that explains how and why evolution happens. Tests: fossil evidence of lineage; species show genetic variation, which accounts for speciation. Also, retrodictions: fact and data not necessarily predicted by evolution, but only make sense in the light of evolution. Relative age layers dictate age, but not all layers laid down in one place. Must therefore cross-reference. (same type of rock with same type of fossil= same age)