Make Punnett squares click.
An interactive genetics trainer for building gametes, completing crosses, catching mistakes, and connecting expected ratios to simulated offspring.
Gamete Builder
Drag each gamete button into the correct parent box, then check your answer.
Gamete buttons
Parent 1 gametes
Parent 2 gametes
Punnett Square Practice
Students can type answers into each cell. Use “Check square” to give instant feedback.
Expected ratios
Genotype and phenotype ratios are calculated from the Punnett square outcomes.
Genotype ratio
Phenotype ratio
Error Finder
This mode intentionally creates one wrong cell. Click the incorrect cell, then check your answer.
Drosophila offspring preview
A tiny visual simulator that turns expected outcomes into a fly population. A useful bridge into the Drosophila Cross Simulator.
How this trainer works
This trainer builds understanding in stages: first identify gametes, then combine them, interpret expected ratios, find deliberate mistakes, and finally compare those expectations with a simulated offspring population. It is intentionally simple, visual, and a little bit mischievous.