ANT 1 Lecture Notes - Lecture 3: Base Pair, Chromosome, Cell Nucleus
Document Summary
Local optima: populations can read a local optimum in value of trait. Disequilibria: when environments change, adaptation takes time. Equilibrium (stasis) - flat line (ex: chimp locomotion last 7 mill years) Punctuated equilibria - quick change towards new phenotype (ex: human body size 1. 8 mya) Gradual change human (ex: brain size over last 500,000 years) Ex: we used to have to work hard for our honey, easy now to get corn syrup. But height variation remains; new variants needed for. Origin, maintenance, & inheritance of variation = natural selection. Cultivated true breeding lines (all offspring are 100% like parents) Cross green & yellow parents (f0 generation) 9 sy + 3 wy = 12 y. 3 sg + 1 wg = 4 g. 12 y : 4 g -> 3:1. 3:1 ratio of yellow to green (f2 generation) F0: true breeders; smooth yellow x wrinkled green. F2: 9 sy, 3 sg, 3 wy, 1 wg.
