Multiple Alleles and Sex-Linked Traits
1. An example of a blood genotype is:
2. An example of a heterozygous genotype for blood is:
3. An example of a homozygous genotype for blood is:
4. What is the phenotype that corresponds to the genotype in #2?
5. What is the phenotype that corresponds to the genotype in #3?
6. Mrs. Wagar has a heterozygous genotype for type A blood. Mr. Wagar has a homozygous genotype
for type B blood. Chucky has type A blood.
a. Complete the Punnett Square using the genotypes of Mr. and Mrs. Wagar.
b. Can Chucky be their son? Why or why not? ___________________________________
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7. Mr. Smith has type O blood. Mrs. Smith has type AB blood.
a. Complete the Punnett Square using Mr. and Mrs. Smith’s blood type.
b. What is the ratio of phenotypes in the offspring?
8. Baldness is a recessive, sex-linked trait that appears on the X chromosome. Use B for not bald and
b for bald. Mr. Williamson is bald and his wife Mrs. Williamson is a carrier for baldness.
a. Complete the Punnett Square below.
b. What are all of the possible genotypes of the offspring?
c. What are the ratios of the genotypes?
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d. Bonus: what are the ratios of the genotypes for just the girls?
What are the ratios of the genotypes for just the boys?
e. What are all of the possible phenotypes of the offspring?
f.
What are the ratios of the phenotypes?
g. Bonus: what are the ratios of the phenotypes for just the girls?
What are the ratios of the phenotypes for just the boys?