Practice Quiz for ABO blood types 1. In the ABO blood system, you normally can be type: a) A b) B c) ABO d) A, B, AB, or O e) all of the above Answer: d) A, B, AB, or O ## CORRECT --> You can be type A, B, AB, or O but not ABO. 2. Which of the following statements is true regarding the ABO blood system? a) People who have the A antigen normally would not produce the anti-A antibody. b) People who are type AB normally produce both anti-A and anti-B antibodies. c) The only ABO type blood that normally does not have either A or B antigens is AB. Answer: a) People who have the A antigen normally would not produce the anti-A antibody. ## CORRECT --> If they produced anti-A antibodies, it would destroy their own blood. However, they do normally produce anti-B antibodies since B type blood would be alien to them. 3. The universal blood donors for the ABO system are type: a) A b) B c) O d) AB Anser:c) O ## CORRECT --> Since type O blood normally lacks both A and B antigens, it will not be recognized as an alien type by the blood of anyone. As a result, anyone usually can be transfused with O blood without concern about rejection for this blood group. 4. Which of the following statements is true about the ABO blood system? a) It was discovered in the 1950's. b) It was discovered by Karl Landsteiner c) Few people are actually typed for this system because of the difficulty of the procedure and high cost. d) a and b Answer: It was discovered by Karl Landsteiner ## CORRECT --> Karl Landsteiner discovered the ABO system in 1900 and 1901 while trying to understand why blood transfusions sometimes saved lives and at other times caused death. 5. An individual's ABO blood type is normally determined by: a) Genetic inheritance and environmental influences during life b) Environmental influences alone c) The inheritance of 1 of 3 possible alleles (A, B, or O) from each parent Answer: c) The inheritance of 1 of 3 possible alleles (A, B, or O) from each parent ## CORRECT --> In most cases these alleles are totally responsible for determining blood type phenotypes. The inheritance usually follows simple Mendelian patterns. However, there are rare exceptions such as the Bombay Phenotype described in the tutorial. 6. In determining the phenotype for the ABO blood system: a) O is dominant over A b) B is dominant over A c) O is recessive d) all of the above Answer: O is recessive ## CORRECT --> The rules of dominance for the ABO system are that A and B are both dominant over O (i.e., O is recessive) and A and B are codominant. 7. If one of your parents is blood type A and the other is type B, which of the following blood types would you likely be? a) A b) B c) O d) AB e) any of the above Answer: e) any of the above ## CORRECT --> Since you could inherit A or O alleles from one parent and B or O alleles from the other, you could be any of the 4 ABO types. Look at the other answers to see how this could be true. 8. Which of the following would be least likely to be accepted as legal proof of paternity? a) ABO blood type evidence b) HLA type evidence c) DNA sequence evidence d) all are equally likely to be accepted Answer: a) ABO blood type evidence ## CORRECT --> Because of the Bombay Phenotype and other possible exceptions, the ABO blood type system is not conclusive in determining whether or not someone could be a parent of a particular child. The other two kinds of evidence are much more reliable. 9. Which of the following statements is true? a) Specific ABO blood types are known to be linked with increased or decreased susceptibility to particular diseases. b) Antibodies to alien antigens in the ABO group may be present in one's body prior to the first contact with blood of a different ABO type. c) When our blood comes in contact with blood of a different type, our bodies can develop long-term immunity to the alien blood type. d) All of the above are correct. Answer: d) All of the above are correct. ## CORRECT --> Look at the other answers to see further explanations.