Biology Forums - Study Force

The effectiveness of geographic barriers in
  promoting speciation is related most to
  a. the size of the barrier.
  b. the inability of the organisms to overcome the
  barrier.
  c. the speed at which the barrier forms.
  d. how long the barrier exists.
  e. the size of the population it separates.

Question 2

Whether a geographic barrier can block gene flow
  depends on an organisms
  a. means of travel.
  b. means of gamete dispersalspeed of travel.
  c. inclination to disperse.
  d. range of travel.
  e. A and B are both correct.

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