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In your neurology practice, you meet a patient who complains of a temporary inability to move her legs, a condition that lasts for hours to days at a time. What is your diagnosis, including a description of the molecular mechanism that underlies this condition?
Derived Homologies
Features shared by descendants of a common ancestor that have undergone evolution to serve new functions.
Synapomorphies
Shared derived characteristics or traits that are used to establish evolutionary relationships among species or groups.
Common Ancestor
The most recent individual from which all organisms in a group are directly descended.
Phylogenetic Systematics
A method of classifying organisms based on their evolutionary relationships, utilizing genetic, morphological, and other data to infer a "family tree" of life.
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