Punnett Square Worksheet.
For each cross, draw a Punnett square, then list the percentages of genotypes and phenotypes. Be sure
to remember that the capital letter represents dominance.
1. Green beans are dominant over yellow beans. A hybrid green bean plant (Gy) is crossed with a
green bean plant (Gy).
2. A hybrid green bean plant (Gy) is crossed with a purebred yellow bean plant (yy).
3. Tall bean plants are dominant over short bean plants. A purebred tall plant (TT) is crossed with
a hybrid tall plant (Ts).
4. A homozygous tall plant (TT) is crossed with a short plant (ss).
5. Two hybrid red flowers (Rw) are crossed (red flowers are dominant, white flowers are recessive)
6. A heterozygous red flower is crossed with a white flower.
7. A homozygous dominant white chicken is crossed with a heterozygous white chicken, the
recessive phenotype is brown.
8. A purebred dominant brown mouse is crossed with a heterozygous brown mouse (tan is the
recessive phenotype).
9. Two heterozygous white rabbits are crossed (white fur is dominant to black).
10. A hybrid white rabbit is crossed with a black rabbit.
11. A homozygous tall bean plant is crossed with a heterozygous plant.