Suppose a researcher discovers a new mutant strain of mice in which individuals develop two extra eyes-one on each ear. One hypothesis that would explain this result is a gain-of-function mutation in Pax6 (or in a gene acting downstream of Pax6).

Question

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Pax6 is a gene that plays a crucial role in eye development. A gain-of-function mutation in Pax6 or in a downstream gene could potentially result in the development of extra eyes, supporting the hypothesis given in the question.

Suppose a Researcher Discovers a New Mutant Strain of Mice