BIO E121 Lecture Notes - Lecture 3: Mustard Plant, Introduced Species, Overproduction
Document Summary
Fall 2019: evolution by natural selection, overproduction + heritable variation = competition for scarce resources. In other words, populations (not individuals) evolve descent with modifications: individuals do not evolve (pokemon lies, environment drives selection, summary, observations, heritable variation, overproduction, competition, conclusions. Survival of fittest traits: descent with modification. Evidence for evolution: artificial selection, humans have done this for a long time. Ex: wild mustard plant (we bred this plant into vegetables we eat, kalem cabbage, broccoli, etc. : we know this works because we do it. Examples: hind limbs in whales and snakes, wings in flightless birds, muscles to move human ear, ancestor had functional structure (remnants of, molecular homology, genetic code virtually universal, homologous genes similar genes due to inheritance from common ancestor. Examples: hemoglobin proteins in different species: large scale homology: 3 domains of life, can compare bacteria, archaea and eukarya, homologies and tree thinking . Some homologies diverged recently shared by smaller group (hemoglobin)
