You are studying two genes that are located on the same chromosome. they are located 55 map units apart. how will the alleles of these genes behave in a dihybrid cross?

They will behave as if they were independent.

Explanation:

The frequency of recombination between genes is directly proportional to the distance between them in the chromosome.  The longer the distance, the higher the recombination frequency.

The maximum recombination frequency between two genes is 50%, because every time recombination happens between 2 chromatids, half of the resulting gametes will be recombinant and the other half will be parental. So if the genes are independent, the observed recombination frequency will be 50%.

1 map unit = 1% frequency of recombination. If the genes are in the same chromosome, but separated by 50 map units or more, the recombination frequency will be 50% and they will behave as they were independent, located in different chromosomes.