The Figure Shown Is a Phylogeny Created with DNA Sequence

question 14

Multiple Choice

The figure shown is a phylogeny created with DNA sequence data and has high bootstrap support values. The tree also includes observed phenotypes (in varying shades of gray) for the five taxa. The character states are indicated by "B" or "b," "G" or "g," and "P" or "p." Evaluate the hypothetical phylogenetic tree using a parsimony approach. How many state changes were required for Taxon 5 ("BGP") if the inferred ancestral state was "bGP"?

• A) one
• B) two
• C) three
• D) four

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Definitions:

Atelectasis

A condition characterized by the partial or complete collapse of a lung or a section (lobe) of a lung, resulting in reduced gas exchange.

SARS

Severe Acute Respiratory Syndrome, a viral respiratory illness caused by a coronavirus, characterized by fever and respiratory symptoms.

Contagious

Capable of being transmitted from one individual to another through direct or indirect contact.

Fatal

Resulting in death; having a deadly or lethal outcome.