BIOB51H3 Lecture Notes - Lecture 19: Frequency Distribution, Heritability, 6 Years

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Natural selection difference in average reproduction of different phenotypes in a population. S = p* - p(bar) initially the population was p* but then only successful ones continue the next generation so they are p(bar) The sign of s tells the direction of selection (negative is decrease trait value, positive is increase trait value) The magnitude of s is the strength of selection (the bigger the difference between the average selection and the average among only those who breed is the magnitude of selection) larger values of s mean there stronger selection. Example: artificial selection on mouse tail length population of lab mice. Interested in why mice tail length varies what physiological processes affect change in tail length. Graph shows initial variation in tail length and the number of mice who have them frequency distribution. Average tail length is about 3 initilally. By looking at the babies on the individuals that they allowed to breed.

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