This interactive activity, adapted from the Dolan DNA Learning Center, illustrates how a tool developed by scientist Reginald Punnett—the Punnett square—validates Gregor Mendel's laws of genetic inheritance. Watch how the Punnett square can be used to display the possible genetic outcomes when two yellow-seed hybrid pea plants are crossed. The results clearly illustrate Mendel's principle of dominance and why the potential offspring traits appear with a predictable 3-to-1 dominant-to-recessive frequency.
This media asset was adapted from Genetic inheritance follows rules. by Cold Spring Harbor Laboratory, Dolan DNA Learning Center.