Sometimes fertilization does occur between different species, but the hybrid embryo is weak and dies.
In some instances the hybrids are vigorous but sterile. An example would be a mule that is produced by a male donkey and a female horse.
This animation (Audio - Important) reviews prezygotic and postzygotic ixolation mechanisms.
REVIEW: The primary reason for hybrid sterility is
REVIEW: Isolating mechanisms that take effect before or during fertilization are termed
REVIEW: Hybrid inviability is an example of what kind of isolation?
REVIEW: Reproductive isolating mechanisms _____ .
a. prevent interbreeding
b. prevent gene flow
c. reinforce genetic divergence
d. all of the above
REVIEW: When potential mates occupy overlapping ranges but reproduce at different times, this is a
case of _____ isolation.
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