Biology

Genotype Probability Calculator

Lets users compute and verify genotype probability instantly with formula, steps and examples — no manual math.

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16
Your result
Gamete types per parent
4

2 heterozygous pairs → 4 gamete types, 16 Punnett cells, 4 phenotype classes.

Punnett square cells
16
Phenotype classes
4

About this calculator

For n heterozygous gene pairs (independent assortment): 2ⁿ gamete types, 4ⁿ genotype combinations, 2ⁿ phenotype classes. A dihybrid cross (n=2) gives the 9:3:3:1 ratio across 16 cells.

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