19. Go to the website for the National Organization for Rare Disorders. Identify an autosomal recessive disorder and an autosomal dominant disorder. Create a family for each one, and describe transmission of the disease over three generations.
http://www.rarediseases.org

20. Go to the website for Gene Gateway—Exploring Genes and Genetic Disorders. Select two disorders or traits that would demonstrate independent assortment if present in the same family, and two that would not.
http://www.ornl.gov/TechResources/Human_Genome/posters/chromosome/chooser.html