Biology · Genetics

🧬 Punnett Square Lab

Predict genetic trait inheritance. Step through 5 guided stages or try different parent combos.

🧬 Punnett Square
Choose a Trait
📋 Step Guide
Step 1 — The Parents
Select a cross or choose a trait, then click ▶ Start Steps.
💡 Key Concept
Dominant alleles (uppercase) mask recessive alleles (lowercase). Two recessive alleles must be inherited to show the recessive trait.