Consider a population in which, over evolutionary time, the coat color of a population or species of organisms changes from light to dark
Using this example of light and dark coat coloration, describe what might occur to produce each of the fol-lowing evolutionary conditions:
A. a derived trait
B. a synapomorphy
C. a homoplasy
D. a symplesiomorphy
ANS:
Will vary, but should include:
• derived trait: coat color changes from light to dark
• synapomorphy: population splits into two distinct populations prior to evolution of dark color then splits again after evolution of dark color
• homoplasy: the trait could have changed many times; the common trait could be analogous rather than homologous
• symplesiomorphy: the derived trait has arisen recently and appears in only one of the two most related species or populations; the two most distantly related groups share the same trait.
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