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Question: giardia intestinalis can cause disease in several different mammalian species...

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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. Giardia infestinalis In 1999, a DNA sequence comparison Giardie muris 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. 1619]:1135-44.) A-D CD Giardia microt
21. Examine the phylogenetic tree diagrammed above. For each conclusion below, indicate whether it is a valid conclusion. a. G. microti evolved before G. intestinalis b. G. microti is more closely related to G. muris than to G. intestinalis intestinalis G. intestinalis. c. G. microti should not be labeled a species distinct from G. d. G. microti is part of a monophyletic group that also includes
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