The correct term for "dominant mutant gene" is actually "dominant genetic mutation." However, there are several synonyms that can be used to describe this concept. One such synonym is "dominant allele," which refers to a gene that is expressed even if only one copy is present. Another synonym is "dominant trait," which refers to a physical or behavioral characteristic that is determined by a dominant gene. Additionally, the term "dominant inheritance" can be used to describe the pattern of inheritance in which a dominant gene is passed down from a parent to their offspring. These synonyms all point to the same concept and can be used interchangeably depending on the context.