BIOB51H3 Lecture Notes - Lecture 4: Microevolution, Tetrapod, Hemoglobin
3 Mar 2019
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Document Summary
Microevolution and macroevolution: evolution under domestication, fossil record, similarity of characteristics, species change by natural selection. Maintenance/change in traits over few generations- occurs within species. Origin of species or higher taxonomic groups. Origin/change in traits that define new taxa. Evidence that ancestral species can give rise to diverse descendants: evolution under domestication. Breeding something to have characteristics that humans can use by use of selective breeding to change the traits of organisms. Strawberries- plant seeds from the plants that produces the largest, juiciest fruits. Dogs were selectively bred from wolves- many varieties from a single ancestor. Developmental gene of skull growth has different alleles, so changing skull type induces genetic change. Although selective breeders were selected on phenotypes, their genotypes were altered. Different variants produce different numbers of offspring. Difference 1: agent of selection (human breeders vs. Environment (biological and physical))- human inspired environmental change is still natural selection because selection is not direct.
