BIOL 102 Lecture Notes - Lecture 4: Models 1, Epigenetics
Document Summary
2 models: hunger gatherer: wolves were domesticated as tools for getting food, agricultural: wolves became tame as they were exposed to human interaction while looking for scraps. Selected only tame foxes for breeding purposes. Turned the aggressive ones into coats since he had to hide his study in a fur factory (evolutionary research was forbidden at the time) Directional selection - - shifting towards one trait. Arti cial selection - - purposefully selected tame foxes so the tame genes could get passed on. Epigenetics - - changes in gene expression that do not involve changes to the underlying dna sequences (change in phenotype without changing genotype) About 2% is coding / the rest in non coding. As the fossil record kept developing he realized trait"s were not xed. Darwin argued that complexity evolved simply as a result of life adapting to its local conditions from one generation to the next. One experience in life would not change progeny.
