In a monohybrid Punnett square exercise, a student puts pod colour and plant height into the same four-box square. What is the correct advice?

توضیح

A four-box square follows the two alleles of one gene, so it has room for one characteristic only, and a second gene brings its own gametes that need their own square. Enlarging the square does not help here, because the exercise is built on crosses that follow a single gene at a time.