試題詳解

39. Your professor wants you to construct a phylogenetic tree of a type of plant called orchids. She gives you tissue from seven orchid species and one lily plant. What is the most likely reason she gave you the lily?
(A) to see if the lily is an ancient orchid species
(B) to demonstrate likely genetic similarities
(C) to see if the lily and the orchids show all the same shared derived characters
(D) to serve as an outgroup