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About Punnett Square Calculator
The Punnett Square Calculator generates genetic cross diagrams for monohybrid (2×2), dihybrid (4×4), and blood type crosses. Supports complete dominance, incomplete dominance, codominance, and sex-linked traits. See all offspring genotypes, phenotype ratios, and probabilities with step-by-step explanations.
Includes a dedicated blood type calculator with ABO alleles and optional Rh factor.
FAQ
A Punnett square is a diagram used to predict genotypes and phenotypes of offspring from a genetic cross, showing all possible allele combinations.
A dihybrid cross involves two genes simultaneously, producing a 4×4 grid with 16 possible offspring. The classic phenotype ratio is 9:3:3:1.
Blood type is determined by the ABO gene with three alleles: Iᴬ and Iᴮ (codominant) and i (recessive). The Rh factor is a separate dominant/recessive gene.
In incomplete dominance, the heterozygote shows a blended phenotype (e.g., pink). In codominance, both alleles are fully expressed (e.g., AB blood type).
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