How to use the dihybrid cross phenotype calculator
Show the classic 9:3:3:1 ratios for two heterozygous genes. Enter number of offspring in the field above; the dominant both traits, dominant a, recessive b, recessive a, dominant b, recessive both are computed instantly and plotted on the chart so you can see how the answer changes.
Formula
Variables
- n — Number of offspring
Worked example
With number of offspring = 160, the calculator gives dominant both traits ≈ 90; dominant a, recessive b ≈ 30; recessive a, dominant b ≈ 30; recessive both ≈ 10.
Frequently asked questions
What is the formula for the dihybrid cross phenotype calculation?
Dominant both traits = n × 9 / 16. Dominant A, recessive b = n × 3 / 16. Recessive a, dominant B = n × 3 / 16. Recessive both = n / 16. Here n is number of offspring.
What inputs do I need for the dihybrid cross phenotype calculator?
You need number of offspring. Each field is pre-filled with a typical example so you can see how the result responds as you edit the numbers.
How do I use this calculator?
Type values into the input fields. Results and the chart update instantly. Use Reset to restore the example values, Copy results to paste them elsewhere, or Share to copy a link that preserves your inputs.
Is the result exact?
Calculations use standard formulas and double-precision arithmetic, then display about seven significant figures. Real-world measurements carry uncertainty, so treat results as estimates unless your inputs are exact.