If Sara has blood group O. The genotype of her mother and father is possible:
Correct answer: C. Bi X Bi
- A. BB X Bi
- B. BB X BB
- C. Bi X Bi
- D. Both A and C
Explanation
Option C is correct. The genotype of Sara's parents can also be Bi X Bi. If both parents have type O blood, there is a 25% chance that they will both inherit the O allele from each other, resulting in a child with type O blood.
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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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