What is an example of linkage (organism, chromosome number, genes)?
Only genes can remain as 'linked'.
On the length of a chromosome, genes are linearly arranged. The location of genes on a single chromosome with respect to one another could be depicted by a linkage map.
The genes on different chromosomes can show independent assortment but genes closely placed on same chromosome would tend to move together during gamete formation, a phenomenon known as 'linkage'.
Less gap between two genes on same chromosome means there is more possibility of these entering together in a gamete.