Bio 94 Discussion Notes.docx

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Department
Biological Sciences
Course
BIO SCI 94
Professor
Diane Livio
Semester
Summer

Description
Bio 94 Discussion Notes Discussion 1: 8/6/13 Evolution • Evolution is fact but the theory of how it works is theory • Def: The change of gene frequencies of a population over time. • What causes the gene frequencies to change? Darwin’s theory of evolution by natural selection • What can cause evolution o Genetic drift (completely random): gene frequencies change by chance due to random events  Ex. natural disaster, what gene gets used  Two categories • Randomness like natural disaster and gametes • Decreasing population size which eliminates the alleles by chance o Mutation: genetic mistakes that lead to the creation of new traits  Bad mutation
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