How are linked genes typically represented in genetic notation?

Linked genes are typically represented in genetic notation using uppercase letters to signify dominant alleles and lowercase letters for recessive alleles, with the convention often reflecting their combinations and interactions. The correct notation reflects pairs of alleles from linked genes rather than standalone or mixed representations.

The notation 'GN' accurately represents linked genes by indicating that both genes are located close together on the same chromosome. This representation suggests that there is a specific dominant allele (G) and a specific dominant allele (N) that are inherited together more frequently than if they were independently assorted. This is critical in genetic mapping and understanding inheritance patterns, particularly in the context of dihybrid crosses.

The other options do not consistently reflect the representation of linked genes as they either fail to denote two different genes together correctly or do not indicate whether the alleles are dominant or recessive. This specific way of denoting linked genes helps researchers and geneticists communicate the inheritance patterns that arise from linked alleles, making option 'GN' the most appropriate choice in this scenario.