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Evaluate Competing Explanations
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AP Biology
APB.052 Evaluate Competing Explanations
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A developmental regulatory gene is normally expressed in one body segment. When experimentally expressed in a different segment, a duplicate appendage-like structure forms there. Which explanation best evaluates the evidence?
A
The gene encodes the structural protein that makes every appendage by itself.
B
The gene helps regulate positional identity and can activate downstream developmental programs in new locations.
C
The duplicate structure proves the organism no longer uses regulatory genes.
D
Expression location cannot affect development because all cells use identical genes in identical ways.
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