Isomorphic gene is a term used to describe genes that have the same function but differ in their DNA sequence. Synonyms for isomorphic gene include homologous gene, corresponding gene, and structurally equivalent gene. Homologous gene refers to genes that share a common ancestor and have similar functions, while corresponding gene is used to describe genes that have a similar function in different species. Structurally equivalent gene implies that two genes have the same structure and function but may have different sequences due to evolutionary divergence. These terms can be used interchangeably depending on the context, but they all describe genes that perform the same function despite differences in their DNA sequences.