Breeding Genetics Calculator
Predict offspring genotype and phenotype ratios from genetic crosses. Visualize Punnett squares and plan your breeding colony.
Gene Configuration
Gene 1
Parent 1 (P1)
Parent 2 (P2)
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Punnett Square
Genotype Ratios
2:1:1| Genotype | Count | Ratio | Percentage |
|---|---|---|---|
| Aa | 2 | 2 | 50.0% |
| AA | 1 | 1 | 25.0% |
| aa | 1 | 1 | 25.0% |
Phenotype Ratios
3:1| Phenotype | Count | Ratio | Percentage |
|---|---|---|---|
| Agouti | 3 | 3 | 75.0% |
| Non-agouti (Black) | 1 | 1 | 25.0% |
How to Use the Breeding Genetics Calculator
- Select your organism - Choose from Mouse, Drosophila, Zebrafish, Rat, or C. elegans. Each comes with pre-configured gene defaults.
- Choose the cross type - Monohybrid (1 gene), Dihybrid (2 genes), or Trihybrid (3 genes).
- Configure genes - Customize gene names and phenotype labels for dominant and recessive traits.
- Set parent genotypes - Select the genotype (homozygous dominant, heterozygous, or homozygous recessive) for each gene in both parents.
- View results - The Punnett square, genotype ratios, phenotype ratios, and probability chart update automatically.
- Plan your colony - Use the colony planning calculator to estimate how many breeding pairs you need.
Understanding Punnett Squares
A Punnett square is a fundamental tool in genetics used to predict the probability of offspring having particular genotypes. Named after Reginald C. Punnett, this diagram cross-references the possible gametes (sex cells) from two parents to show all possible offspring combinations.
In a monohybrid cross (one gene), the Punnett square has 4 cells (2x2). A classic example is crossing two heterozygous parents (Aa x Aa), which produces a 1:2:1 genotype ratio (AA:Aa:aa) and a 3:1 phenotype ratio (dominant:recessive).
Dihybrid crosses (two genes) produce a 4x4 grid with 16 cells, and the famous 9:3:3:1 phenotype ratio when crossing two double heterozygotes (AaBb x AaBb). Trihybrid crosses produce an 8x8 grid with 64 cells.
This calculator supports all three cross types and provides instant visualization of results, making it an essential tool for genetics researchers, students, and breeding colony managers.
Frequently Asked Questions
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