1: Introduction


In this module, we’re going to talk about an approach to probability which is specific to genetics, called Punnett Squares. Punnett Squares were invented by one Reginald Punnett, a British geneticist who also studied ribbon worms and played cricket with G. H. Hardy of Hardy-Weinberg fame, one of the true big cheeses in the genetics world. In this module, you’ll see how Punnett Squares are really just a graphical way of reproducing the basic rules of probability. You’ll also see how to predict the phenotypic outcome from a multi-loci genotypic cross – in other words, how to predict what the kids will look like.