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.) Giardia muris Giardia intestinalis Subgroups A-D C D Giardia microbi A Look at the phylogenetic tree of G. intestinalis in the figure above. Would you describe G.intestinalis as a monophyletic, polyphyletic or paraphyetic group? Why? TE FREM
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.) Giardia muris Giardia intestinalis Subgroups A-D C D Giardia microbi A Look at the phylogenetic tree of G. intestinalis in the figure above. Would you describe G.intestinalis as a monophyletic, polyphyletic or paraphyetic group? Why? TE FREM
Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
Section: Chapter Questions
Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...
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![Giardia intestinalis can cause disease in several different mammalian species, including humans
Giardia organisms (G. intestimalis) that infect humans are similar morphologically to those that
infect other mammals, thus they have been considered a single species. However, G. bntestinalis
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.)
Giardia intestinalis
Subgroups A-D
D'
Giardia muris
Giardie microt
ALook at the phylogenetic tree of G. ntestinalis in the figure above. Would you describe
G.intestinalis as a monophyletic, polyphyletic or paraphyetic group? Why?](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F9bac9ef5-cb14-4a6e-9ca2-213faf80b8f7%2F03c0b9b1-923f-49fc-91ce-6d9a3f9d379f%2Ffhp9n3w_processed.jpeg&w=3840&q=75)
Transcribed Image Text:Giardia intestinalis can cause disease in several different mammalian species, including humans
Giardia organisms (G. intestimalis) that infect humans are similar morphologically to those that
infect other mammals, thus they have been considered a single species. However, G. bntestinalis
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.)
Giardia intestinalis
Subgroups A-D
D'
Giardia muris
Giardie microt
ALook at the phylogenetic tree of G. ntestinalis in the figure above. Would you describe
G.intestinalis as a monophyletic, polyphyletic or paraphyetic group? Why?
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