Punnett's Square
Let's say you want to find the possible genotypes (the "genetic code") for a planned Pointer litter.
The stud dog's phenotype is black (the acutal coloration of the dog) and you know that his
genotype is a Black 3, black carry orange (BBEe). The bitch's phenotype is liver and you know
that her genotype is a Liver 6, liver carry lemon (bbEe).
Here's an easy way to set up the Punnett's Square to find the off springs' possible genotypes.
First take the "B" part of each of the dogs' genotype. Put the stud dog's "B's" (BB) along the top of the graph
and the bitch's "B's" (bb) along the side.
This is how the square will look set up.
Then you take a "B" from the stud dog and match it with a "B" from the bitch to
fill in the graph.