BIOL 202 Lecture Notes - Lecture 10: Eristic, Probability Distribution, Phenotype
Document Summary
Influence of many environment effects: continuous variation of phenotypes. E. g. eye color, height, weight: bell shape distribution (normal distribution) of the variations in population, the more genes involved, the smoother of the curve. Important in medicine, understanding evolution, genetics: eristic traits can be counted. E. g. fly bristles on the abdomen: threshold traits e. g. tendency to develop heart disease (has both genetic and environment factors) Edward tobacco flower experiment: continual variation of flower size, there is some bell distribution in both short and long inbreed lines (i. e. continuous variation of within the same phenotype, cross of long and short flowers. F1 has intermediate length, with variation spread around the mean value. F2 has intermediate length, variation is spreading, larger distribution of variation, smoother curve of the bell shape. Interbreed by selecting parents of different length from f2, Produces progeny that has similar length, but the distribution of variation is still spreading.
