City University of New York
Bio Lab Module: Breaking the Genetic Code
Try this interactive module from the Brooklyn College to help understand the genetic code and how changes in the code effect the final protein product.
National Institute of Educational Technologies and Teacher Training (Spain)
Ministerio De Educacion: Genetica Humana
This is a great unit on human genetics. It contains 17 interactive activities.
McGraw Hill
Glencoe Biology: Molecular Genetics: Chapter Test Practice
Try these nineteen questions which serve as a chapter review over concepts in molecular genetics.