1. Punnett Square Practice Problems
Level 1
Analysis of Crosses
Involving One Trait

2. Spider Bodies Dominant allele: Hairy (H) Recessive allele: Bald (h)
Male: Heterozygous
Genotype_______ Phenotype_______
Female: Heterozygous
Make a Punnett square to predict the offspring.

3. Spider Bodies What genotypes are possible in the F1 generation?
What phenotypes are possible in the F1 generation?
What is the genotypic ratio of this cross?
What is the phenotypic ratio of this cross?

4. Butterfly Wings Dominant allele: Striped (S)
Recessive allele: Spotted (s)
Male: Homozygous recessive
Genotype_______ Phenotype_______
Female: Homozygous dominant
Make a Punnett square to predict the offspring.

5. Butterfly Wings What genotypes are possible in the F1 generation?
What phenotypes are possible in the F1 generation?
What is the genotypic ratio of this cross?
What is the phenotypic ratio of this cross?

6. Maple Tree Trunks Dominant allele: Thick (T)
Recessive allele: Thin (t)
Male: Homozygous dominant
Genotype_______ Phenotype_______
Female: Heterozygous
Make a Punnett square to predict the offspring.

7. Maple Tree Trunks What genotypes are possible in the F1 generation?
What phenotypes are possible in the F1 generation?
What is the genotypic ratio of this cross?
What is the phenotypic ratio of this cross?

8. Flamingo Beaks Dominant allele: Pointy (B)
Recessive allele: Rounded (b)
Male: Heterozygous
Genotype_______ Phenotype_______
Female: Homozygous
Make a Punnett square to predict the offspring.

9. Flamingo Beaks What genotypes are possible in the F1 generation?
What phenotypes are possible in the F1 generation?
What is the genotypic ratio of this cross?
What is the phenotypic ratio of this cross?

10. Leopard Spots Dominant allele: Even number (E)
Recessive allele: Odd number (e)
Male: Homozygous dominant
Genotype_______ Phenotype_______
Female: Homozygous recessive
Make a Punnett square to predict the offspring.

11. Leopard Spots What genotypes are possible in the F1 generation?
What phenotypes are possible in the F1 generation?
What is the genotypic ratio of this cross?
What is the phenotypic ratio of this cross?

12. Pig Tails Dominant allele: Curly (T) Recessive allele: Straight (t)
Male: Heterozygous
Genotype_______ Phenotype_______
Female: Heterozygous
Make a Punnett square to predict the offspring.

13. Pig Tails What genotypes are possible in the F1 generation?
What phenotypes are possible in the F1 generation?
What is the genotypic ratio of this cross?
What is the phenotypic ratio of this cross?

14. Moose Antlers Dominant allele: Large (L) Recessive allele: Small (l)
Male: Homozygous recessive
Genotype_______ Phenotype_______
Female: Heterozygous
Make a Punnett square to predict the offspring.

15. Moose Antlers What genotypes are possible in the F1 generation?
What phenotypes are possible in the F1 generation?
What is the genotypic ratio of this cross?
What is the phenotypic ratio of this cross?

16. BEAR CLAWS Dominant allele: Sharp (S) Recessive allele: Dull (s)
Male: Heterozygous
Genotype_______ Phenotype_______
Female: Heterozygous
Make a Punnett square to predict the offspring.

17. BEAR CLAWS What genotypes are possible in the F1 generation?
What phenotypes are possible in the F1 generation?
What is the genotypic ratio of this cross?
What is the phenotypic ratio of this cross?