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Living Environment Regents June 2010 Question 69 PDF Print E-mail
NYS Living Environment Regents June 2010
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Diagram 3 is an example of a simplified cladogram. A cladogram is dichotomous phylogenetic tree that branches repeatedly, suggesting a classification of organisms based on the time sequence in which evolutionary branches. Each branch point is defined by synapomorphies or shared derived characters unique to the lineage that arises at that point. In Diagram 3, species A and B have shared characters which could be represented by the bands in Diagram 2 that appear on the same spot and with the similar thickness.

On the other hand, the ancestor of species A and B share a common character with species C but since it quite apart from the characteristics of  A and B, only few bands are common in the three species.
 

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