Okay, a punnett square is used to determine all possible outcomes of a breeding between a male and female. In its simplest definition.

Let's consider the gene that determines hair color. For the male, he has two alleles for this gene: B codes black hair, and b codes blonde hair. The same goes for the female.

For an example of how to draw a punnett square refer to http://en.wikipedia.org/wiki/Punnett_squ...

From all 4 possible outcomes, i.e BB, Bb, Bb and bb, there is a 1/4 chance that their offspring will have the BB allele or bb allele, and a 2/4 chance that their offspring will have the Bb allele.

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