BIOLOGY 152 Chapter Notes - Chapter 2: Probability Distribution
25 Jan 2017
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Chapter 2 the everyday math of evolution: chance, selection and time. Small differences compound to be large differences! Darwin use pigeons to illustrate his ideas of natural selection. Castle"s rats confirm that selection on small degrees of continuous variation was sufficient for evolution. [norton"s question is: given an initial frequency of a trait in a population, how long would it take to increase or decrease that frequency under different rate of selection?] Selection coefficients: indicates the incremental difference in relative reproductive success and survival between individuals with a trait and those without it, always indicate relative advantage and disadvantage, also apply to the rate of change in traits themselves. Difficult to measure in wild: long time periods, need quantitative data and samples to detect subtle adaptation evolving (smaller margin of error)- not valid if not, hard to include or control all the selective agents in wild.
