Which mutations are generally dominant since one copy in a diploid organism is sufficient to alter the normal phenotype

The correct answer - Gain of function.

Explanation:

"Gain of function" is a type of mutation that makes one of the allele in diploid organism to change the normal behavior or trait which them dominant mutations.

gain of function

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the relative standard reduction potential of the half-cell in which reduction occurs; more positive than the other half-cell. reduction is a chemical process in which electrons are added to an atom or an ion; it always occurs accompanied by oxidation of the reducing agent.