Fill in Punnett squares for one-trait crosses and give the chance of each genotype and phenotype. There are 3 sheets here: one-trait crosses, more crosses and genetics terms. Pick one from the tray, print it, and add its answer key as a second page if you want one.
Fill in each square. Then give the chance of each genotype and phenotype as a fraction of 4.
They suit grades 7 to 10. Each sheet in the tray practices it a different way, so you can pick the one that fits.
Yes. Tick “add the answer key as page 2” before printing, or turn on Answer key to check work on screen.
Yes. Press New problems for a fresh set of the same kind, then print again. The answer key changes with it.
No. The sheets print straight from this page, free, with no sign-up.