Transcription of groups of genes in eukaryotes
Eukaryotes do not have operons (groups of genes expressed together). Eukaryotic genes have more distance between them than prokaryotic genes, and eukaryotes need greater control over gene expression.
Eukaryotic genes that have a similar function tend to share control elements with similar sequences of genetic code.
This means that the same set of transcription factors can bind to all the control elements for this group of genes. This means that the genes with similar functions can be expressed at the same time (a bit like an operon, but with more control).
Each gene has its own promoter sequence . The promoter regions and other control elements of similar genes have similar sequences. This allows the genes to be expressed at the same time.