Dihybrid Cross Punnett Square Calculator

Calculate dihybrid cross genetics, Punnett square results, and phenotypic ratios for two-trait inheritance.

Parent Genotypes

Dominant: Recessive:
Dominant: Recessive:

Results

Select parent genotypes to generate Punnett square

Dihybrid Cross Principles

Mendel's Laws

  • • Law of Segregation: Alleles separate during gamete formation
  • • Law of Independent Assortment: Genes assort independently
  • • Law of Dominance: Dominant alleles mask recessive ones

Expected Ratios

  • • F1 Cross: 9:3:3:1 phenotypic ratio
  • • Test Cross: 1:1:1:1 phenotypic ratio
  • • Genotypic ratios vary by cross type
  • • 16 possible combinations in F2