Work out dihybrid cross instantly with clear inputs, formula shown and shareable results.
Applies the classical dihybrid expectations for independently assorting genes, including the 9:3:3:1 self and 1:1:1:1 test cross ratios.
Dihybrid ratios
AaBb x AaBb gives 9:3:3:1 by phenotype; AaBb x aabb gives 1:1:1:1, which is why the test cross reveals gamete frequencies
Linkage, epistasis, lethal genotypes and gene interaction all distort it.
Its phenotype ratio equals the gamete ratio of the heterozygous parent, so it measures recombination directly.