BIOLOGY 202L Lecture Notes - Lecture 12: Chromosome, Petal, Delaware Route 3
21 Jan 2016
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Focusing on differentiation due to differences in alleles in loci. Complex/polygenic/quantitative traits: traits which vary within a species due to differences in genes, loci, alleles at loci, and/or environment experienced by different individuals. Graph trait value or measure vs % population bell-shaped curve in which most individuals have intermediate values continuous: non-discrete categories of phenotypes like in mendelian traits. Some exceptions/traits are actually discrete unmeasured susceptibility or risk (yes or no) ex: disease status (yes or no) Variance: how far away individuals are from the mean: vx = [sum from i=1 to n (xi - mean) 2] / n sum of deviations from the mean squared. Genetic relation/component to variation seen within families and/or environments: extreme parents producing average offspring. Test by dna sequencing or collecting seeds from both and grow up if genetically identical should have same distribution in next generation. Lecture 13: ex: less resources, smaller petals in order to conserve energy.
