Dominant and recessive phenotypes.
(1) Parental generation. (2) F<sub>1</sub> generation. (3) F<sub>2</sub> generation. Dominant (red) and recessive (white) phenotype look alike in the F1 (first) generation and show a 3:1 ratio in the F<sub>2</sub> (second) generation
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Originally from <a class="external text" href="https://en.wikipedia.org">en.wikipedia</a>; description page is (was) <a href="https://en.wikipedia.org/wiki/Image:Mendelian_inheritance_3_1.png" class="extiw" title="en:Image:Mendelian inheritance 3 1.png">here</a>