Frequency-dependent selection in side-blotched lizards
A yellow-throated side-blotched lizard is smaller than either the blue-throated or orange-throated males and appears a bit like the females of the species, allowing it to sneak copulations. Frequency-dependent selection allows for both common and rare phenotypes of the population to appear in a frequency-aided cycle.
Source
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"OpenStax College, Adaptive Evolution. October 16, 2013."
http://cnx.org/content/m44586/latest/Figure_19_03_02.jpg
OpenStax CNX
CC BY 3.0.
