What information does a punett square provide?
Genetic ratio models
We use punnett squares to model the likelihood of a gene set appearing. On the top you write the alleles for one parent and on the side the alleles for the other. Each square then contains one allele from the top row and one allele from the side. If the allele is Gg at the top then every square in the first column has a big G, and a little g in every square of the second column. You do the same for the rows so each square has an allele from it's column and for it's row.
You then look at the square and compare it to the other squares to get a ratio. Maybe 1/4 squares is G and whatever, and 3/4 is little g and whatever. So you would say there is a 1/4 (25%) chance of offspring of the top parent and side parent having a child with big G alleles.