Are you stuck on what is genetic linkage?
Normally when we talk about dihybrid crosses we are looking at two different traits where the genes responsible are on different chromosomes (i.e trait A on Chromosome 2 and trait B on Chromosome 7), but sometimes the two traits were are looking at are on the SAME chromosome. If this is the case then we will see a different inheritance pattern in the offspring - there will be less variation as the genes are inherited together as a pair.
The following page has some walk through videos that show meiosis of linked genes with and without crossing over. Click here. (Sex linked traits are also discussed here, this may be interesting as an extension)
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