A man of blood group A marries a woman of blood group B and they have one child. Which one of the following statements about the child's blood is correct?
Correct answer: D. It could be any of the groups A, B, AB and O.
- A. It could be group A only.
- B. It could be group AB only.
- C. It could be group A or group B only.
- D. It could be any of the groups A, B, AB and O.
Explanation
ABO blood group in humans is controlled by three different alleles IA, IB and i. While the dominant alleles (IA and IB) code for the antigens A and B, respectively, i allele (which is recessive to both IA and IB) does not code for any antigen. The blood group of the man is A, which means the possible genotypes are IAIA or IAi. Likewise, the blood group of the woman is B, which means the possible genotypes are IBIB or IBi.Therefore, A, B, AB, and O are the possible blood groups of offspring when a man with blood group A marries a woman with blood group B.Diagram:
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About Inheritance
Mendel's laws explain segregation, independent assortment and the prediction of genetic ratios using alleles, genotypes and phenotypes. The chapter also covers linked genes, recombination and crossing over during meiosis, then applies pedigree reasoning to X-linked recessive traits, which show different inheritance patterns in males and females.
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