An unusual loss-of-function mutation that is not recessive is

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A dominant-negative mutation produces an altered gene product that acts antagonistically to the normal protein. This means that even a single copy of the mutant allele can disrupt the function of the normal protein, producing a dominant effect. This is different from a recessive mutation, which requires both copies of the gene to be mutated to produce a phenotype. A null mutation completely eliminates the function of the gene, but this type of mutation is often recessive. A hypomorphic mutation reduces the level of gene activity but is also often recessive. A conditional mutation expresses a phenotype only under certain conditions, such as changes in temperature or the presence of specific chemicals. Epistatic mutations affect the phenotype of other genes.

An Unusual Loss-Of-Function Mutation That Is Not Recessive Is