Genetic problems

http://biology.clc.uc.edu/courses/bio105/geneprob.htm

http://www.biologycorner.com/worksheets/genetics_practice.html

http://www.k-state.edu/biology/pob/genetics/intro.htm

Variation and inheritance animation:
http://www.bbc.co.uk/schools/gcsebitesize/science/ocr_gateway/understanding_organisms/variation_inheritanceact.shtml