BIO201H5 Lecture Notes - Lecture 5: Selective Breeding, Natural Selection, Allele
Document Summary
Outline importance of variations: natural selection vs artificial selection, the modern synthesis, patterns of selection, processes that cause evolution. Individuals within populations vary (genetically) true of human and non-human populations: variations are seen in traits such as skin/hair/fur color, size/mass, blooming time in flowers, etc. Variation and natural selection: among individual organisms of a species, genetic variation/differences are not imperfections, but the material from which natural selection shapes better adapted forms of life. Variation in domestic animals: darwin believed natural selection was a long-term process, was familiar with variation in domesticated animals. Aim of breeders: produce animals/plants with particular human-desired characteristics. The selective breeding of plants and animals to produce specific human desirable traits: selection by humans, on domesticated plants and animals, has a purpose/goal, goal oriented results in many breeds of dogs. 2008: discovery of fossils (finger bone, toe, 2 teeth) of extinct humans from the.
