ap exam big idea: evolution Flashcards
Evidence for evolution
Comparative anatomy biogeography Embryology Fossil record Biological classification Molecular biology
Species
A reproductively isolated population able to interbreed and produce fertile offspring
Allopathic speciation
Species separated geographically develop into different species
Sympatric speciation
Populations in the same environment adapt to fill different niches
protobionts
Droplets of segregated chemicals - early protobionts were RNA that evolved into DNA
Analogus structures
Similar function different origin
Homologous structures
Same origin and structure different function
Punctuated equilibrium
Large change occurs quickly with long periods of no change
Molecular clock hypothesis
Linear rate of evolutions
Stabilizing selection
Eliminates extreemesat both ends
Directional selection
One extreme is selected against
Disruptive selection
Favors both extremes but not the middle
prezygotic barriers
Ecological, temporal, behavioral, mechanical physiological
Post zygotic barriers
Inevitability or sterility of offspring
Domains
Archaea, bacteria, eukaria