Transcript Slide 1
Diversity through extrapolation of microevolutionary mechanisms Groupings Population Local group of orgs of one species Groupings Species Populations of orgs that may interbreed to produce fertile offspring Isolation of Subpopulations Mechanisms of evolution cause isolated subpopulations to diverge Geographic Isolation Populations are physically separated Geographic Isolation Natural selection, mutations, and gene flow occur independently in isolated populations Reproductive Isolation Pops overlap, but are unable interbreed successfully Prezygotic Behavioral Temporal Mechanical Mating Season for Group A Mating Season for Group B JFMAMJJASOND Reproductive Isolation Postzygotic Inviability Infertility Evidence of Evolution Fossil Record Extant species are not the only ones to have existed on Earth Evidence of Evolution Fossil Record Some fossils indicate missing links between extant groups Rates of Change Gradualism Punctuated Equilibrium Evidence of Evolution Homologous Structures Evidence of Evolution Analogous Structures Evidence of Evolution Vestigial Structures Evidence of Evolution Biochemistry Molecular comparisons indicate relations (closer match = closer relation) DNA Hybridization Protein Comparison (amino acid sequence) A B C A B A+B Evidence of Evolution Similarity in embryology indicates common ancestry Sponge Jellyfish Clam Insect Human Evidence of Evolution Chicken Fish Human Rabbit Salamander