BIOL 2301 Lecture Notes - Lecture 35: Natural Selection, Twin Study, Inbreeding
15 Sep 2016
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Document Summary
So far in the class, the traits we have studied have a relatively simple correspondence between genotype and phenotype. Any given genotype does not completely explain phenotype, environmental affects. Don"t know all the genes that affect it. Many factors can affect the distribution of a trait in the population. Shape doesn"t provide how much variability is genetic, environmental, etc. Natural selection can shift the distribution of traits in a population. If there is no selection at all, then one distribution. Many separate variables all assorting independently being summed up. The main two quantities that describe a normal distribution are mean and variance. Mean: sum all values, divide by total variance: measure of how wide the distribution is, n 1: sample of population, n: population, s2 don"t memorize equations. The greater the variance in the population, the broader the distribution sigma used for whole population. Significantly different: compare how many standard deviations separate the two means.
