Trihybrid Cross Punnett Square Calculator

A trihybrid cross Punnett square is a genetic diagram used to predict the inheritance of three different traits simultaneously. It creates an 8×8 grid showing all 64 possible combinations of offspring genotypes when crossing two parents that are heterozygous for three traits.

A trihybrid cross Punnett square contains 64 boxes (8×8 grid). This is because each parent can produce 8 different types of gametes when heterozygous for three traits (2³ = 8), resulting in 8×8 = 64 possible offspring combinations.

Genotype probability is calculated by counting the number of times a specific genotype appears in the Punnett square and dividing by the total number of combinations (64), then multiplying by 100 to get a percentage. Formula: P = (count / 64) × 100%.

The classic trihybrid cross ratio for phenotypes (when all three traits show complete dominance) is 27:9:9:9:3:3:3:1. This means 27/64 offspring show all three dominant traits, while only 1/64 shows all three recessive traits.

Enter genotypes using 6 letters representing 2 alleles for each of the 3 traits. For example, 'AaBbCc' means heterozygous for all three traits. Use capital letters for dominant alleles and lowercase for recessive alleles.

Gametes are the reproductive cells (sperm or egg) that carry one allele for each trait. In a trihybrid cross with genotype AaBbCc, the possible gametes are: ABC, ABc, AbC, Abc, aBC, aBc, abC, and abc - totaling 8 different combinations.

Yes, you can customize the allele letters for each trait. Just make sure to use consistent notation where capital letters represent dominant alleles and lowercase letters represent recessive alleles for the same trait.

Heterozygous means having two different alleles for a particular trait (e.g., Aa). In contrast, homozygous means having two identical alleles (either AA for homozygous dominant or aa for homozygous recessive).