Biology Forums - Study Force

Two individuals are members of the same species if they
  a. possess the same number of chromosomes.
  b. breed at the same time.
  c. are phenotypically indistinguishable.
  d. can mate and produce fertile offspring.
  e. look alike.

Question 2

Incompatibilities between the developing embryo and the maternal organism that cause the embryo to
  abort spontaneously may prevent individuals of different populations from producing fertile offspring.
  Such differences may be an example of
  a. isolating mechanisms.
  b. allele frequencies.
  c. mutations.
  d. founder effects.
  e. gene flow.

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