Punnett Square Calculator
Calculate offspring genotype and phenotype probabilities from parental alleles.
The Punnett Square Calculator predicts the probability of offspring genotypes based on parental allele contributions. Enter how many dominant alleles (0, 1, or 2) each parent carries.
A parent with 2 dominant alleles is homozygous dominant (AA), 1 is heterozygous (Aa), and 0 is homozygous recessive (aa). The calculator computes the probability of dominant phenotype, homozygous dominant, heterozygous, and homozygous recessive offspring.
Punnett squares are fundamental tools in Mendelian genetics used to predict inheritance patterns for single-gene traits like eye color, blood type, and genetic disorders.
Frequently Asked Questions
What is a Punnett square?
A Punnett square is a grid used to predict the genotypes and phenotypes of offspring from a genetic cross between two parents.
What do dominant alleles 0, 1, 2 mean?
0 = homozygous recessive (aa), 1 = heterozygous (Aa), 2 = homozygous dominant (AA). This represents how many copies of the dominant allele the parent carries.
What is the difference between genotype and phenotype?
Genotype is the genetic makeup (AA, Aa, aa). Phenotype is the observable trait. Both AA and Aa show the dominant phenotype.