Sympatric species
Biological species concept definition
Reproductive isolating mechanisms:
. . . . prezygotic: geographic, ecological, temporal,
. . . . . . . . . . . . . behavioral, mechanical, prevention of
. . . . . . . . . . . . . gamete fusion
. . . . postzygotic: hybrid inviability, hybrid infertility
Problems with the biological species concept
Adaption
Sympartic speciation
Allopatric speciation
Instantaneous speciation through polyploidy
. . . . Autopolyploidy
. . . . Allopolyploidy
Disruptive selection
Darwin's finches
Gradualism vs. punctuated equilibrium
Mass extinctions