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Why Genetic Mutation May Not Result in an Altered Phenotype

A single base-pair mutation in the gene of a model organism has been found. However, an individual homozygous for this mutation shows no phenotype. How is this possible?

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There are many ways this could happen:

1. The protein encoding this gene could be redundant-another gene could compensate for the mutation, so no effect would be seen.

2. The mutation could have been silent, so that the base change did not change the amino acid in ...