Breeding Calculator
Estimate offspring outcomes for two parents based on dominant and recessive traits. Ideal for simple Mendelian genetics predictions.
Published by:
isCalculator Editorial Team
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How to use this tool?
How to Use the Breeding Calculator
- Enter Parent Genotypes – In the Parent 1 and Parent 2 fields, type exactly two letters (e.g.,
Aa,aa,Bb). Use a capital letter for the dominant allele and lowercase for the recessive. Only letters A/a, B/b, C/c, D/d are accepted. - Calculate – Click the Calculate button or press Enter while in either input field.
- View Results – The tool shows:
- Dominant Phenotype and Recessive Phenotype percentages (e.g., 75% dominant, 25% recessive).
- Genotype Ratio – List of possible genotypes with their probabilities (e.g.,
Aa:50.0%; aa:50.0%). - Phenotype Ratio – Summary of dominant vs. recessive outcomes.
- Explanation – Brief description of the cross and Punnett square logic.
- Error Handling – If you enter invalid input (e.g., wrong length or invalid letters), a red error message appears. Correct the input and recalculate.
Tip: This calculator assumes simple Mendelian inheritance for a single gene. Use only one gene pair per parent (e.g., Aa not AaBb).
Previous Results
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Frequently Asked Questions
It predicts the probability of offspring genotypes and phenotypes based on the genotypes of two parents, using Mendelian inheritance.
Use two letters per parent: capital for dominant allele, lowercase for recessive. For example, 'Aa' or 'aa'. Only letters A/a, B/b, C/c, D/d are accepted.
It shows the percentage chance of dominant vs recessive phenotype, the genotype ratio, and a brief explanation.