Name ________________________ Hour _______ 7th Grade Science Worksheet Punnett Squares Identify the following as genotypes or phenotypes. If it is a genotype, identify if it is homozygous dominant, homozygous recessive, or heterozygous. 1. GG 2. Bb 3. Blue eyes 4. tt 5. Yellow seeds 6. Pink flowers 7. Zz 8. Yellow coat color 9. Ability to roll tongue 10. pp 11. In flowers, red flowers (F) are dominant to white flowers (f). In a cross of a red flowered heterozygous plant and a white flowered homozygous recessive plant, what would the possible genotypic ratio of the offspring? What percentage of the offspring are homozygous dominant? What percentage of the offspring are heterozygous? What percentage of the offspring are homozygous recessive? 12. In dogs, wire hair (H) is dominant to smooth (h). In a cross of a homozygous dominant wire-haired dog with a homozygous recessive smooth-haired dog, what will be the possible phenotypes of the offspring? What will be possible genotypes? 13. In pea plants, spherical seeds (D) are dominant to dented seeds (d). In a genetic cross of two plants that are heterozygous for the seed shape trait, what percentage of the offspring should have spherical seeds? 14. Red flowers (R) are dominant to white flowers (r) in snapdragons. What would the genotypic ratio be if you crossed a homozygous red flower snapdragon with a heterozygous red flower snapdragon?