References
http://205.180.85.40/w/pc.cgi?mid=10866&sid=7271
http://www.accessexcellence.org/AB/BC/Gregor_Mendel.html
http://www.netspace.org/MendelWeb/MWpaptoc.html
101 Key Ideas: Genetics
http://www.library.villanova.edu/html2/lib/mendel/mendexhib.htm