Name:

Macroevolution Fill-in

Macroevolution is the development of new taxonomic groups such as _________________________________

Speciation - "a three step process"

  1.  
    1. Allopatric (allo = other)
      1. gene flow broken by space ( _______________________________________ ).
      2. Kaibab & Abert's squirrel
    2. Sympatric (sym = same)
      1. Gene flow broken for _____________________________ (often genetic reasons).
      2. Can work within geographic context
      3. _____________________: about 25% of plants - wheat
  2.  
    1. The various mechanisms of _________________________________ go to work.
  3.  
    1. Pre-mating barriers (pre-zygotic barriers)
      1. _____________________ isolation - different breeding times (Eastern & W. spotted skunks)
      2. different habitats -
      3. _____________________ isolation -
      4. "mechanical" problems - damsel fly
      5. gametic isolation -
    2. Post-mating barriers (post-zygotic barriers)
      1. _________________________________
      2. zygote inviability
      3. hybrid sterility

Macroevolution Phenomena

  1. _________________________________ - Cope's rule (Equus)
  2. _________________________________
  3. _________________________________
    1. Increase in diversity due to adaptation
    2. _________________ explosion
    3. Cretaceous explosion of angiosperms
    4. Placental mammals- end of Cretaceous
  4. Rates ___________________________
    1. Gradualism vs Punctuated Equilibrium

The goal of evolution is _________________________ more advanced organisms