If Two Nonsister Species (Any Pair of Species Other Than

question 30

Essay

If two nonsister species (any pair of species other than Species 2 and 3) on the phylogenetic tree in the figure below differ from the other two in a single character state (e.g., the nonsister species have light fur, whereas the sister species have dark fur), where would the likely evolutionary change(s) be? Indicate change(s) by drawing an X-or Xs-on the tree. Be sure to label each X as a loss or gain. In this case, assume that the ancestral state was "dark fur."

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