Punnett Square Calculator: Predict Genetic Crosses
Predict the genetic outcome of a cross between two parents (Monohybrid).
What is a Punnett Square?
A Punnett Square is a graphical representation used by geneticists to predict the possible genotypes of offspring in a particular cross or breeding experiment. It is named after Reginald C. Punnett, who devised the approach.
How to Use a Punnett Square
- Identify the genotypes of both parents (e.g., Homozygous Dominant 'AA' or Heterozygous 'Aa').
- Place one parent's alleles across the top and the other parent's alleles down the side.
- Fill in the four boxes by combining the allele from the top with the allele from the side.
- Analyze the results to determine the Genotypic and Phenotypic ratios.
Frequently Asked Questions
What is the difference between Genotype and Phenotype?
The Genotype is the genetic makeup of an organism (e.g., 'Bb'), while the Phenotype is the observable physical trait (e.g., 'Brown Eyes') determined by that genotype.
What does Heterozygous mean?
Heterozygous means having two different alleles for a particular gene (e.g., 'Aa'). Homozygous means having two identical alleles (e.g., 'AA' or 'aa').