Human Genetics Practice Problems - Weebly
Name: _____________________________________ Period: ________ Date: ________________
ABO Blood Types Practice Problems
Solve each of the following problems below. Show all of your work.
1. In humans, the ABO blood system is controlled by three alleles: IA, IB, and i. Betsy and Bob have two children named Billy and Belle. Betsy has type A blood and Bob has type B blood. Billy’s blood is type AB, but Belle’s blood type is type O. Use a Punnett Square to answer the questions below.
a. What is Betsy’s genotype for her blood type? ________________
b. What is Bob’s genotype for his blood type? _________________
c. What is Billy’s genotype for his blood type? _________________
d. What is Belle’s genotype for her blood type? ________________
e. If Betsy and Bob have a third child, what is the probability the child would have type B blood? Explain. ________
____________________________________________________________________________________________
2. Betsy’s sister, Barbie, has type AB blood. Barbie’s husband, Barney, also has type AB blood. Is it possible for Barbie and Barney to have a child with type O blood? What possible blood types can their potential children have? Use a Punnett square to show your work.
a. What is Barbie’s genotype for her blood type? ________________
b. What is Barney’s genotype for his blood type? _________________
c. What are the possible genotypes for their potential children?
__________________________________________________________________
3. Two women have given birth to girls in the same hospital at the same time. The nurses think they may have accidentally switched the babies’ name tags and given the babies to the wrong parents. One baby, Jane, has type O blood and the other baby, Mary, has type A blood. The father in one set of parents, the Browns, has type A blood while the mother has type B. The father in the other set of parents, the Greens, has type AB blood while the mother has type O. What are the genotypes of the parents? Which baby belongs to which parent?
a. What is Jane’s genotype for her blood type? _____________
b. What is Mary’s genotype for her blood type? ________________
c. What is Father Brown’s genotype for his blood type? ________________
d. What is Mother Brown’s genotype for her blood type? _________________
e. The Brown’s baby is: _____________ Because: ________________________
f. What is Father Green’s genotype for his blood type? ________________
g. What is Mother Green’s genotype for her blood type? _________________
h. The Green’s baby is: _____________ Because: _____________________
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