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Dihybrid Cross Punnett Square — result sheet
Calculate genotype and simplified phenotype percentages for a two-locus cross using nine canonical parent genotypes.
Inputs used
Results
Visual chart
Breakdown
Calculation steps
Returned data table
Formula and methodology
Formula: Each parent produces four equally weighted two-locus gamete slots; combine 4 x 4 slots, count nine genotypes, and group them into A_B_, A_bb, aaB_, and aabb.
This bounded two-locus probability model generates gametes from two selected diploid genotypes, combines all 16 equally weighted pairings, normalizes genotype spelling, and reports nine genotype and four complete-dominance phenotype percentages. It assumes independent assortment, random segregation, two alleles at each locus, and no viability or trait inference.
This result follows the calculator's declared inputs, precision, validation boundaries, and model limits.
Input contract
- Parent A genotype — 9 choices
- Parent B genotype — 9 choices
Worked example
| Input | Value |
|---|---|
| Parent A genotype | AaBb |
| Parent B genotype | AaBb |
Genotypes AABB 6.25%, AABb 12.5%, AAbb 6.25%, AaBB 12.5%, AaBb 25%, Aabb 12.5%, aaBB 6.25%, aaBb 12.5%, aabb 6.25%; phenotype classes A_B_ 56.25%, A_bb 18.75%, aaB_ 18.75%, aabb 6.25%.
Assumptions and limits
- The cross contains two loci, A/a and B/b, with two allele forms at each locus and canonical genotype spelling.
- Each parent segregates alleles randomly, the loci assort independently, and every one of the 16 gamete pairings is equally weighted.
- Phenotype classes use complete dominance at both loci: A_ means at least one A, B_ means at least one B, and the result is a probability model rather than a statement about health, ancestry, or an individual diagnosis.
Calculator note
Source and methodology
Use the official WorldCalculate methodology policy for the source, formula, precision, and boundary standards behind this calculator.
Planning estimate, not financial, medical, legal, or professional advice. © WorldCalculate — reuse with attribution. Built and curated by Hassan ALRowaie.
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