BIOA01H3 Lecture 3: Lec03_A01_Evidence1_Sept5_2014POST.pdf
1 Oct 2014
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2. 2 lineages should change over time and sometimes diverge (speciate) 2. 3 natural selection occurs & leads to adaptation. Lec 3: evidence: what is evolution, evolution is a theory. Theory" is different from everyday use: not a guess or a hunch, well-supported, well-tested explanation for our observations. Law of gravity if you drop something it will fall to the ground: this is a description. Theories to describe why: newton"s theory of universal gravitation, einsteins" general theory of relativity. Lec 3: evidence: what is evolution, definition of evolution. What is biological evolution: change in allele frequencies in populations changes in genetic characteristics of populations. Lec 3: evidence: what is evolution, shorthand view of darwin"s idea. Evolution usually happens gradually: populations change over hundreds to thousands of years. Speciation occurs: one species splits into two or more species. Much of evolutionary change was caused by natural selection. We can think about evolution at two scales:
