Genetics Punnette Squares
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Here's some online help if you're having trouble with Punnett Squares.
http://www.athro.com/evo/gen/punexam.html
Peas Soup
http://www.sonic.net/~nbs/projects/anthro201/exper/
Genotypes and Phenotypes
http://www.brooklyn.cuny.edu/bc/ahp/BioInfo/SD.Geno.HP.html
More Punnett Squares
http://askabiologist.asu.edu/punnett-squares