BI110 Chapter 17: BI111 Chapter 17 - Microevolution.docx
Document Summary
Chapter 17 microevolution: genetic changes within populatioins. Microevolution small scale heritable change in the genetics of a population. Have side to be taken place when allele frequencies experience a shift. Population all individuals of a single species that live together at the same place and time. In some species, individuals appear very differently, but in most cases, appear alike. Phenotypic variation differences in appearance or function passed through generations. Qualitative variation exist in two or more discrete states, and intermediate forms are absent. Snow geese have either blue or white feathers mendel studied. Quantitative variation individuals differ in small, incremental ways. A broad, low curve indicates a lot of variation among individuals. A high, narrow little . Polymorphism the existence of discrete variants in a character. Human blood type a, b, o are polymorphic. Phenotypic variation caused by environment, therefore genetic and phenotypic variations may not correlate. Only genetically based variation is subject to evolutionary change.
