Table of Contents

• Punnett Squares in Theory
• 1: Introduction
• 2: The Punnett Menu
• 3: Creating combinations chez Punnett
• 4: Insults by the dozen
• 5: Punnett menu revisited
• Punnett Squares in Practice
• 6: Onwards to Genetics
• 7: Recap of genetics vocab
• 8: Can this marriage be saved?
• 9: Vampire Fangs
• 10: Example: Spock and Jax
• 11: Example: Spock and Nurse Chapel
• Bigger Punnett Squares
• 12: And you thought we were done!
• 13: The Dreaded Double Hybrid
• 14: Another Dihybrid Cross
• 15: Is the ratio exact? (Hint: NO!)
• 16: Review

Introduction

In the module on probability, we talked about Laws of Probability that can be applied to, well, just about anything … rolling dice or determining the probability of survival, or playing the stock market, or genetics, to name a few. In this module, we're going to talk about another approach to probability, which is much more 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.