Multiple choice

Which of the following types of epistatis takes place when one mutation has the opposite effect in the spectre of another mutation?

  1. Additivity

  2. Positive epistasis

  3. Negative epistasis

  4. Genetic enhancement

  5. Sign epistasis
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E Correct answer
Explanation

Sign epistasis occurs when one mutation has the opposite effect when in the presence of another mutation. This occurs when a mutation that is deleterious on its own can enhance the effect of a particular beneficial mutation. For example, a large and complex brain is a waste of energy without a range of sense organs, however sense organs can be more useful if the organisms brain is better able to process the information.

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