Seals are thought to have evolved within a group of taxa, including today’s weas

Question

Seals are thought to have evolved within a group of taxa, including today’s weasels, whose common ancestor had weasel-like characteristics, and sea lions in a group of taxa, including bears, whose common ancestor had bear-like characteristics. Seals and sea lions are recognized as pinnipeds. Based upon this information, fill in the correct letters in the blanks below.   Draw a tree diagram that illustrates these relationships.  

            Bears are ________                                        A. monophyletic

            Pinnipeds are ________                                  B. paraphyletic

            Sea lions are ________                                  C. polyphyletic

          Seals are ________             

          Weasels are ________

Explanation / Answer

-Bears are polyphyletic

-pinnipeds are monophyletic

- sea lions are phylogenetic

- seals are monophyletic

- weasels are paraphyletic

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