Once you have the genotypic array it is fairly easy to get the phenotypic array.  Simply specify the "rules" for going from a genotype to a phenotype.

Example 1:  In the cross AaBb x AaBb the genotypic array is: 

Genotypic Array = 1/16AABB + 1/8AABb + 1/16AAbb + 1/8AaBB + 1/4 AaBb + 1/8Aabb + 1/16aaBB + 1/8aaBb + 1/16aabb.

In this example, let both the A and B Loci show complete dominance and assume that there is no lethality, no epistatic interaction and that the penetrance is 100%.  The rules for assigning phenotypes under these conditions are:

(where the blank means that any allele is possible). If confused by this terminology click here.

Under these specified conditions,  the phenotypes and corresponding genotypes are:

It is often easier to calculate the phenotypic array for each locus separately and then multiply the phenotypic arrays without calculating the intervening genotypic array.

Example 2: Consider the cross of AaBb x Aabb.  The Gametic Arrays are given below:

The corresponding genotypic arrays are: 

Genotypic Array A gene =  (1/2A + 1/2a) * (1/2A + 1/2a) = 1/4AA + 1/2Aa + 1/4aa

Genotypic Array B gene = (1/2B + 1/2b) * 1b =  1/2Bb + 1/2bb

Since these genes show complete dominance we can convert the genotypic arrays into phenotypic arrays.

The phenotypic array for the A and B genes due to independent assortment is the product of the separate phenotypic arrays.

(3/4A +1/4a) * (1/2B + 1/2b) = 3/8AB + 3/8aB + 1/8aB + 1/8ab