We have a new link up to Bio-Rad Laboratories. You can now see several resources there that can give you further information about what you did in Paul's lab AND can find kits that can make it possible for you to repeat portions of that experiment in your own classroom.
Also, there is a free poster that shows beautifully the process of how a gene (i.e. genotype) can affect a trait (i.e. phenotype). See the Bio_Rad Labortories resource link for information and call Bio-Rad at 1-800-876-3425, ext. 1 to request a free copy of this poster for your classroom.