Punnett Square Calculator
Cross two parent genotypes for a single trait and get the offspring genotype ratio, phenotype split, and carrier probability.
Dominant phenotype (%)
75
Detalhamento
- Recessive phenotype (%)
- 25
- AA offspring (%)
- 25
- Aa offspring (%)
- 50
- aa offspring (%)
- 25
- Carriers (%)
- 50
- Cross
- Aa × Aa
Última atualização:
FAQ
What does a Punnett square show?
It lists every combination of parental alleles — one gamete per row and column — so each cell is one equally likely offspring genotype. The classic Aa × Aa cross yields 25% AA, 50% Aa, and 25% aa, which is the familiar 3:1 phenotype ratio.
What is a carrier in genetics?
A heterozygote (Aa) who carries one recessive allele without showing the trait, because the dominant allele masks it. Two carriers have a 25% chance of a child expressing the recessive condition per pregnancy.
Does the square work for blood types?
The principle does, but blood type involves three alleles (IA, IB, i) with co-dominance, so a simple two-allele square is not enough. This calculator covers single-gene, two-allele Mendelian traits.
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