Enter two parent genotypes to build a full Punnett square. Works for monohybrid (one gene) and dihybrid (two genes) crosses, with genotypic and phenotypic ratios.
Enter two parent genotypes and get the full Punnett square, genotypic ratio, and phenotypic ratio. Works for one gene (monohybrid) or two genes (dihybrid).
Two letters per gene: AA, Aa, or aa. For dihybrid, use four letters like AaBb.
How to use this Punnett square
Type each parent’s genotype using standard letter notation. For one gene use two letters like Aa. For two genes use four letters like AaBb. The calculator sorts each allele into the correct position, builds the grid, and gives you the ratios.