Groups of related but distinctly different genes that occur together in clusters are called:

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Multigene families are groups of related but distinctly different genes that occur together in clusters. These genes often have similar functions and are believed to have arisen from gene duplication events. Tandem clusters refer specifically to genes that are adjacent to each other on a chromosome, while segmental duplications refer to larger stretches of DNA that have been duplicated within a genome. Single-copy genes, on the other hand, exist as only one copy within a genome.

Groups of Related but Distinctly Different Genes That Occur Together