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In the guppy (Poecilia reticulata), a South American fish, males have
a pattern of colorful and very variable spots. Guppies from streams inhabited by their major fish predator (Crenicichla) have smaller, less variable, and less contrasting spots than guppies inhabiting streams that lack this predator. A scientist, John Endler, mixed a sample of zoo guppies from a Crenicichla inhabited stream to a site that lacked the predator. About 15 generations later (2 years), he found that the size of the males’ spots and the diversity of color patterns had increased so that the population now looked like those living in streams lacking the predator. This is an example of:
A.     balancing selection.
B.     sexual selection.
C.     disruptive selection.
D.     directional selection.
E.     kin selection.
 

 
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