What's a Punnett square you might ask Red? Well I will you tell and you better listen well!
Well red, do you know what an allele is? I assume no so let me explain! An allele is like a flavor of a genes and in these genes; there are different types of alleles dominant or recessive. In the Punnett Sqaure a capital letter is dominates while a little letter is recessive. These alleles are the traits that make you who you are. Eye color, height, hair color are all "flavors" of alleles.
A Punnett square is tool used by scientist that help scientist figure how the ratios and probability of an offspring with certain characteristics based off the parents of the offspring.
To Use a punnett square you need to find the alleles of the parents. When you have them you would put them in a punnet sqaure. If you had "Bb" as the fathers eyes, and "bg" as the mother you would put the father on top and put the B in the first column and the b in the second column. For the mother you would put here on the side and align the b in the first row and the g in the second row