A child with AB blood group who was born to a mother of the genotype IAIA cannot have the father of the genotype:
Correct answer: A. IA IA
- A. IA IA
- B. IB IB
- C. IB IO
- D. IB IB and IB IO
Explanation
A is the correct option because the genotype of the mother is IA IA. A child with blood group AB will have a genotype IA IB. This genotype of the child is possible in 2 cases either if the genotype of the father is IB IB or IB IO. However a genotype IA IA of the father will not result in the AB blood group of the child. Thus the correct answer is option A.
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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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