1) All of the following are reproductive isolating mechanisms except:

A    structural differences between male external reproductive organs in different
      species of millipedes
B    difference in the timing of breeding seasons of male frogs
C    differences in food preferences between two populations of birds
D    differences in courtship song between two populations of meadowlarks
E    failure of meiosis in hybrids formed between two populations of insects

2) Which of the following reproductive isolating mechanisms is postzygotic?

A   gametic isolation
B   behavioral isolation
C   hybrid inviability
D   temporal isolation
E   mechanical isolation

3) The process in which a population moves into a relatively unexploited environment
   and then undergoes rapid evolutionary divergence to produce many separate
   species is called:

A   adaptive radiation
B   Convergence
C   sympatric speciation
D   genetic drift 
E   gene flow   

4) The process of a new species arising within the range of the parent populations is

A   Semispeciation 
B   adaptive radiation
C   convergent evolution
D   sympatric speciation
E   allopatrric speciation

5) In zoos, lions and tigers mate and produce viable hybrid offspring called tiglons or
  ligers. Hybrids were never recorded in Asia, however, where their ranges once
  overlapped. Hybrids were probably not produced because of:

A   hybrid inviability
B   gametic mortality
C   behavioral isolation
D   mechanical isolation
E   temporal isolation

6)Two plant species can often hybridize. The hybrid progeny may become self-fertile
   through polyploidy, giving rise to a distinct new species. This is an example of:

A   allopatric speciation
B   gene flow
C   sympatric speciation
D   genetic drift
E   balanced polymorphism


1)  C
2)  C
3)  A
4)  D
5)  C
6)  C