Punnett Square Trihybrid

Summary

The trihybrid Punnett square calculator generates an 8x8 grid showing all 64 gamete combinations from a cross involving three gene pairs. Enter any valid genotypes for both parents and the tool instantly computes every offspring genotype, color-codes dominant versus recessive expression, and tallies the phenotype ratio. It assumes complete dominance and independent assortment for all three loci.

How it works

1. Parse each parent genotype into three allele pairs (gene A, gene B, gene C).
2. Generate all 8 possible gametes for each parent using binary combination logic.
3. Populate an 8x8 grid by combining each maternal gamete with each paternal gamete.
4. Determine the phenotype of each offspring by checking for at least one dominant allele per gene.
5. Count unique genotypes and phenotype classes, then display the ratio summary.

Use cases

• Predict offspring ratios in genetics homework and exams.
• Verify hand-calculated trihybrid crosses quickly.
• Visualize how three independently assorting genes combine.
• Teach Mendelian inheritance with an interactive, color-coded grid.
• Calculate the probability of a specific phenotype in a cross.
• Compare expected ratios for complete dominance in three traits.
• Support lab reports that require genotype frequency analysis.
• Help students understand the product rule applied across three loci.

Frequently Asked Questions