BIOLOGY 171 Lecture Notes - Lecture 9: Courtship Display, Allele Frequency, Genetic Drift

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Video: sometime species have treat that don"t look like they would increase their survival. Peacocks tail: he hated peacocks because he didn"t understand how it could evolve (extreme reaction). Peacocks tail seen as impediment to survival > heavy, dif cult to take around, take energy to grow, slow them down, hard to hide. Sometimes species have traits that don"t look like they would increase survival, darwin noticed this, he couldn"t explain them through natural selection: darwin: in 1859 published book of natural selection, he did not include these traits. Thought about it for 20 years and the published another book the decent of man- felt with human evolution and sexual selection. Biological evolution: changes in allele frequency inn a population over time. Evolution processes: mutations (lecture 4): only evolution process that creates new alleles (testable material, natural selection (lecture 7 and 8, sexual selection (lecture 9, genetic drift, genetic ow.

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