ES101 Lecture Notes - Lecture 13: Microevolution, Evolution, Mutation
Document Summary
Chemical evolution: organic molecules, biopolymers and chemical reactions. Form in seas then later on land. Theory of evolution: charles darwin, life comes from life, all species evolved from species. Microevolution process: genes mutate, individual are selected, and populations evolve. Gene pool: collection of genes for next generation. Alleles: gene may have 2 or more different molecular forms. Microevolution can cause new species to be created as dna is mutated. Natural selection: genetic traits that increase chances of survival genetic variability. Differential reproduction: reproduce more offspring than peers. Adaptive trait: better survive in environment, prevents extinction. Directional natural selection: individuals at the end of the spectrum become more common, when member migrate. Stabilizing natural selection: eliminate individuals on both ends of spectrum, envr. changes little and most adapt. Diversifying natural selection: favour both ends, cause pop to be split. Bats and moths, adapt and evolve bc of prey/predator ex. Ecological niche: role species plays in ecosystem, occupation.
