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Mendelian Inheritance Simulator

Interactive Punnett-square simulator for medical genetics: cross two parent genotypes for a single-gene trait, watch a real offspring population form generation by generation, and compare the observed genotype ratios against Mendel's predicted 1:2:1 law in real time.

Genetics & Evolution2DEasy60 FPS📱 Mobile-adapted⇄ 3D version

Medical genetics leans heavily on a very old piece of math: Gregor Mendel's Punnett square. This simulator crosses two parent genotypes for a single gene, draws a fresh generation of offspring every tick by flipping which allele each parent passes on, and tallies the resulting genotypes live. Set both parents to carriers (Aa × Aa) to reproduce the textbook 1:2:1 ratio behind recessive monogenic diseases, or try Aa × aa to see the 50% affected-child risk that genetic counsellors quote to carrier couples. Toggle dominance to see how a heterozygous carrier can look identical to a homozygous dominant individual (complete dominance) or show a visibly blended phenotype (incomplete dominance).

⚙ Under the hood

Explore Mendelian inheritance through a Punnett square, visualizing allele segregation and genotype probabilities.

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2D · HTML5 Canvas 2D · 60 FPS target · runs fully client-side, no install