Biology 1201A Lecture Notes - Lecture 20: Reproductive Isolation, Gene Flow, Population Genetics
Document Summary
Change in allele frequencies that occurs over time within in a population. Large scale evolutionary patterns in the history of life, major changes in species, speciation. Usually - populations that can interbreed and produce fertile offspring. Organized the organisms - for the greater glory of god. Gave them species names using binomial nomenclature = genus + species epithet. Systema naturae (first book with species names) Delineate species based on measurable, observable traits. Populations that cannot interbreed are different species. Problems with biological species concept: cannot determine the reproductive behaviour of extinct organisms, where to draw the species boundary for asexually reproducing organisms, or, difficult to figure out whether they reproduce sexually, how and with whom. This is what is typically used to define a species. Provides a means to explain how species have evolved. Investigate traits, behaviour, physiology that lead to reproductive isolation. These must be heritable, phenotype derived from genotype, link with population genetics and microevolution.
