ZOL 341 Lecture Notes - Lecture 1: Gene Flow, Phylogenetic Tree, Mutation
Document Summary
Evolution: the theory that all organisms are related by a common ancestry, and due to natural selection, have diversified. It is believed that life originated from a single source some 3. 5 billion years ago. Evolution is responsible to the creation and extinction of species. Natural section is based on a genetic variation, which will appear as a phenotypic difference. This causes one phenotype to be favored over another, leading to an alteration in the gene frequencies. In populations, there are variations in the expression of traits. These variations are passed from one generation to the next. Some of these traits give individuals a greater fitness. Genetic changes in a population over time i examined by evolutionary geneticists. Migration- the movement of individuals from one population to another. Gene flow- movement of a species from one population to another. Mutation- (very) slow addition of nitrogenous bases in dna resulting in a phenotypic difference that increases the diversity of a population.
