This site from Access Excellence provides a good description of Punnett squares. However, if you are a more hands-on, visual learner, you may want to find a few other resources with more examples.

Great genetics site with a very good section on Punnett squares.

A complete, student-paced lesson on genetics and inheritance. Students work their way through illustrations and animated tutorials, and answer review questions along the way. There is a self-checking quiz at the end of the lesson.

Geniventure engages students in exploring heredity, genetics, and the protein-to-trait relationship by breeding and studying virtual dragons. Students play through six levels of challenges, conducting simulated experiments that generate...

This site explains genetic beliefs before and after Mendel, and also includes a section on Mendel himself and his experiments, entitled, "The Monk and his Peas".

What is the probability that a baby will be a boy or a girl? Learn how to do monohybrid and dihybrid crosses in this interactive tutorial.

Students use this article to identify how probability is used to predict outcomes of genetic crosses.

Brief text summary of what students learn in the Dragon Genetics I lab along with links to download Student Handouts and Teacher Preparation Notes in PDF and Word formats. Multiple gene inheritance and the cause of genetic linkage are...