A girl has blood group A and her brother has blood group B. Which combination of genotypes cannot belong to their parents:
Correct answer: D. Option D
- A. Option A
- B. Option B
- C. Option C
- D. Option D
Explanation
In this option, both parents have the genotype "OO." The blood group O is represented by the genotype "OO." However, this combination of genotypes "AO" for the girl and "BO" for the brother cannot be produced by parents with the genotype "OO." Blood group O is a recessive trait, so individuals with the genotype "OO" will have blood group O only. It is not possible for parents with blood group O to have children with blood groups A or B. Therefore, Option D cannot belong to their parents.
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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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