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Comprehensive Punnett Square Review
Show your work for each problem.
Simple one-trait cross
1. In guinea pigs, black fur is dominant to white fur. A female guinea pig is homozygous for black fur is mated with a male that is homozygous recessive for white fur.
Key Parent Genotypes Punnett Square Phenotypic ratios
Testcross
2. In plants, red flowers are dominant to white flowers. Perform a testcross on a flower that is red and produces all red flowers.
Key Possible Parent Genotypes Punnett Square#1 Punnett Square#2 Red flower genotype?
Dihybrid
3. In rats, black fur is dominant to white fur and long tails are dominant to short tails. Cross two individuals that are heterozygous for both. Hint: Use FOIL.
B-black L – long BbLl x BbLl
b – white l - short
Incomplete Dominance
4. In tulips, red flowers are incompletely dominant to white flowers. Mate these two parents.
Key Parent Genotypes Punnett Square Phenotypic ratios
Codominance
5. In guinea pigs, white fur is codominant to black fur. Cross a white guinea pig with a heterozygous guinea pig.
Key Parent Genotypes Punnett Square Phenotypic ratios
Blood Typing
6. Karen has blood type A. Her son, Jonathon has blood type O.
The possible fathers for Jonathon are Jeff (blood type AB) and Jason (blood type B).
Based on Jonathon’s blood type, what is Karen’s genotype? __________
Which man is the father of Jonathon? _________ What is the father’s genotype? _________
Sex-Linked Traits
7. In fruit flies, eye color is sex-linked. Red eyes are dominant to white eyes. Cross a red eyed male and a heterozygous red eyed female.
Key Parent Genotypes Punnett Square Genotypic ratios
Sex-Linked Pedigrees (H=normal and h=hemophilia)
[pic]
8. Write down the genotypes for the following individuals;
Queen Victoria - _______ Prince Albert - _______ Edward VII - _______ Leopold - _______
9. Cross Queen Victoria and Prince Albert in a Punnett Square. Write the names of their offspring in the appropriate box.
10. If Frederick William (III-5) married his cousin Alice (III-8), could they produce a hemophiliac female? Prove your answer using a Punnett Square.
11. The current English ruling family (Queen Elizabeth II) has gone for five generations without a hemophiliac individual. This is because Edward VII, Victoria’s son, did not have hemophilia. Explain how this fact eliminated the hemophilia gene from the current line of English rulers.
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