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Use the Following Information to Answer the Question

question 11

Multiple Choice

Use the following information to answer the question.
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. 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. The following phylogenetic tree was constructed from the sequence comparison of rRNA from several subgroups of G. intestinalis and a 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.)

According to the phylogenetic tree in the figure above, G. intestinalis constitutes a ________ group.

Definitions:

Milgram's Experiment

A series of social psychology experiments conducted by Stanley Milgram, which measured the willingness of participants to obey an authority figure who instructed them to perform acts conflicting with their personal conscience.

Participants Complied

The situation where individuals involved in a study or activity adhere to the instructions or rules provided.

American Culture

The customs, traditions, and values of the United States, including influences from Native American, Latin American, African, Asian, and European cultures.

Cultural Norms

Shared expectations and rules that guide the behavior of people within social groups or cultures.