BIOL 174 Lecture Notes - Lecture 10: Human Skin Color, Epistasis, Quantitative Genetics
Document Summary
A central question is when we look at a trait , like body height or hair color, to what extent are the indiv. differences in pop. is caused by genes versus environment. Mendel first saw that traits that were in discrete categories that were heritable. But typically there is quantitative variation, and not discrete many genes affect the trait, and not top of them, the degree of the environment will smear things out and have a spread of variation. 3 loci with 2 alleles affects qualitative trait of human skin color. for continues trait there are genetic and environmental factors. environment grandparents are in can affect your traits. Variance of opoulation is calculated as this equation and standard deviation is square root of variance. Quantitative genetics is better used over standard deviations because the variances can be added. Phenotypic variance can bee partitioned into vg and ve, genetic variance and environmental variance.
