BIO120H1 Lecture 4: BIO120 Lecture 4, Section 0101 - September 19, 2018 (10am - 11am)
19 Sep 2018
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Bio120 lecture 4: evolutionary significance of genetic variation. September 19, 2018 (relevant reading why evolution is true, coyne: chapter 5) In a field of australian daises, majority are white flowers, but there"s a less popular yellow variant key starting point to darwinian evolution for natural selection. If yellow variant becomes advantageous, we can expect to see more yellow variants in the population next generation. Genetics (key to evolutionary theory: variation individual variation in a population, heredity progeny resemble their parents more than unrelated individuals. Selection some forms are more successful at surviving and breeding than others in a given environment. Mutation: ultimate source of heritable variation. A stable change in the dna sequence: change from one generation to the next. Occurs at a low but variable rate. Some neutral mutations spread through population by chance genetic drift. Most mutations get lost because they neither harm nor benefit us.
