Cold Spring Harbor Laboratory
Dna From the Beginning: Genetic Inheritance Follows Certain Rules
Find out what happened when Mendel crossed two hybrid pea plants. The animations do a good job explaining why these crosses produce a 3:1 ratio of traits.
University of Washington
University of Washington: Mendel's Experiments
This site is a summary of a lecture given at the University of Washington about Mendel's Experiments concerning the 3:1 segregation ratio.