Synteny

In genetics and genomics, the term synteny has two different definitions.In classical genetics, the term denotes the existence of several genetic loci on the same chromosome, regardless of whether this relationship can be established by conventional tests for genetic linkage. In particular, two loci may be known to be syntenic even if their recombinant frequency cannot be distinguished from unlinked loci by practical experiments. Therefore, all genetically linked loci are syntenic, but not all syntenic loci are genetically linked. Loci located on different chromosomes are non-syntenic.
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Loci on the same chromosome which may or may not be linked.