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Shana has a genetic disorder that requires frequent transfusions because her red blood cells tend to clump in the capillaries, causing oxygen starvation and intense pain. Shana is suffering from:
Monophyletic Clade
A group of organisms that includes an ancestor and all of its descendants, representing a single branch on the tree of life.
SIV Strain
A specific variant of the Simian Immunodeficiency Virus, which is a non-human primate virus closely related to the Human Immunodeficiency Virus (HIV).
Gene Trees
Diagrams that show the inferred evolutionary relationships among various genes derived from different species.
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