Okay I can help with this Genotype and phenotype are very similar-sounding words that are related, but actually mean different things. The genotype is the set of genes in our DNA which is responsible for a particular trait. The phenotype is the physical expression, or characteristics, of that trait.
Using the square is quite simple
First you have to establish your parental cross, or P1.Next you need to make a 16 square Punnett Square for your 2 traits you want to cross.The next step is to determine the genotypes of the two parents and assign them letters to represent the alleles.