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Punnett Squares Practice Worksheet
I. In rabbits, long hair is dominant and short hair is recessive. A pure bred short haired
guinea pig is bred with a hybrid long haired. What does each of those look like? (use H)
1. Pure bred short hair (homozygous recessive) _______________
2. Hybrid (heterozygous) _________________
3. Make the Punnett square:
Pure Bread Short Hair (homozygous recessive)
h
______
H
____
4. What fraction of the babies will be Hh? ______/4
5. What percent of the babies will be Hh? ______%
6. What fraction of the babies will be hh? ______/4
7. What percent of the babies will be hh? ______%
8. How many dominant alleles (H) does a baby rabbit need to have to have long hair?
9. How many recessive alleles (h) does a baby rabbit need to have to have short hair?
10. What fraction of the babies will be long haired? ______/4
11. What percent of the babies will be long haired? ______%
12. What fraction of the babies will be short haired? ______/4
13. What percent of the babies will be short haired? ______%
Hybrid
hh
Hh
h
h
Hh
Hh
hh
hh
2
50
2
50
2
50
2
50
