Punnett Square Calculator
Explore genotype and phenotype probabilities for one autosomal locus with two alleles and complete dominance.
A QUICK WALKTHROUGH
How to use this tool
- Select both parental genotypes.
- Choose the dominant allele: A or a.
- Review four equally likely offspring combinations and their probabilities.
Calculation
Each parent contributes one allele. Each cell has probability 1/4; cells with the same genotype are combined.
Model and limits
Simple Mendelian model: one autosomal locus, two alleles, complete dominance, independent random gametes. It excludes linkage, sex-linked inheritance, penetrance, mutations and environmental effects. It is not genetic diagnosis.
GOOD TO KNOW
Common questions
Is this professional guidance?
No. This is an educational calculation only. Values stay in your browser.