Genetics Worksheet #9 Blood Types
Name: ____________________________________
1. In humans, the gene for type A blood and type B blood show codominance so that a person with both type genes has a blood type AB. Both A and B dominate type O. A person with IAi genotype married a person having IBIB genotype. List the genotypes their children can be expected to show as well as their children’s phenotypic ratios.
2. Suppose a father with type B blood and a mother of type O blood have 13 children, all with type B blood. What are the probable genotypes of the father, mother, and kids?
3. Suppose you have IAi blood and you marry a person with IBi blood. What blood genotypic ratios can you expect in your offspring? Show the Punnett square and ratio.
4. A young lady with type O blood gave birth to a baby with type O blood. In a court case, she claims that a certain young man is the father of the child. The man has type A blood. Could he be the father of the child? Can it be proven of this evidence alone that his is the father? Show work!
5. What is the probable genotype ratios among children born to a mother having the genotype IAi and a father with blood type AB?
6. One parent has type A blood and the other parent has type B blood. What are their possible genotypes? What are the possible different genotypes of their children if they marry and produce a large number of children?
7. A woman with blood type B has a child with blood type O. What are the genotypes of the baby and mother? Which genotypes could the father have been?
8. What kinds of blood types are possible in each of the following crosses?
A. O x O __________________________________________________
B. O x A __________________________________________________
C. O x B __________________________________________________
D. O x AB __________________________________________________
E. A x AB __________________________________________________
F. A x AB __________________________________________________
G. B x AB __________________________________________________
H. AB x AB __________________________________________________
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