BIOL-Q 201 Lecture Notes - Lecture 20: Genetic Drift, Allele Frequency, Mendelian Inheritance
Document Summary
Evolutions: darwin"s theory of natural selection, all species tend to produce many more offspring than the environment can support. Example: one female cod can lay 2-5 million eggs in one season: those individuals must compete with each other for limited resources. Limited amount of food, territory, nesting sites, potential mates: individuals vary greatly in their characteristics. Why does the variation need to be heritable: selective pressures = selection . Example: what selected for antibiotic resistant bacteria: selection (definition): any pressure (predator, environmental change, humans, etc. ) that causes some individuals to die or not reproduce, while others having a different set of characteristics. This results in an increase in the frequency of the successful trait in the population over time: many more offspring than can be supported, inherited vs. acquired characteristics. Incomplete dominance: with incomplete dominance you obtain red and white offspring in the f2 generation, according to blending inheritance, the f2 offspring would be.
