Genetics · Interactive activity
Punnett Square Challenge
Build real Punnett squares, then work through five inheritance scenarios. Each step is tagged to a learning target, and your results show mastery by target — not just a single score.
What you'll do
First, explore the interactive square builder to see how parent genotypes produce offspring ratios. Then take the challenge: five scenarios where you determine genotypes, build squares, predict ratios, and reason about inheritance.
Learning targets
- VocabularyUse genetics vocabulary (dominant/recessive, homozygous/heterozygous, genotype vs. phenotype).
- GenotypesDetermine an organism's genotype from a description.
- Punnett squaresConstruct a complete, correct Punnett square.
- RatiosPredict genotypic and phenotypic ratios and probabilities.
- ReasoningInterpret results to reason about inheritance and probability.
1. Square builder
Set each parent's genotype for a black/brown fur gene (B = black, dominant; b = brown, recessive) and watch the offspring ratios update.
Parent 1
Parent 2
2. Take the challenge
Five scenarios, scored by learning target, with a mastery summary and optional completion code at the end.
Teacher note
Results break down by learning target using a
4–1 mastery scale, and students receive a randomly generated completion code
(e.g., GEN-PS-1234). The code is optional evidence of completion,
generated in the browser — it is not secure proof of identity. You decide
how, or whether, codes and target results are recorded. The companion resources include matching
worksheets and an Excel tracker keyed to these same targets.
Challenge complete
Mastery by learning target
This code is randomly generated and is optional evidence of completion — not secure proof of identity. Share it and your target results with your teacher only if they've asked you to.