Use the Following Information to Answer the Corresponding Questions)

question 31

Multiple Choice

Use the following information to answer the corresponding questions) .
Giardia intestinalis can cause disease in several different mammalian species, including humans. Giardia organisms G. intestinalis) that infect humans are similar morphologically to those that infect other mammals; thus, they have been considered a single species, though other species in the Giardia genus infect other organisms. However, G. intestinalis has been divided into different subgroups based on their host and a few other characteristics.
In 1999, a DNA sequence comparison study tested the hypothesis that these subgroups actually constitute different species. T following phylogenetic tree was constructed from the sequence comparison of rRNA from several subgroups of G. intestinalis few other morphologically distinct species of Giardia. The researchers concluded that the subgroups of Giardia are sufficiently different from one another genetically that they could be considered different species. T. Monis et al. 1999. Molecular systematics of the parasitic protozoan Giardia intestinalis. Mol. Biol. Evol. 16[9]:1135- 44.)
Figure 27.1
-According to the phylogenetic tree in the figure above, Giardia intestinalis constitutes a _ group.

• A) paraphyletic
• B) polyphyletic
• C) monophyletic

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