Which of the following is a universal donor?
Correct answer: D. O
- A. A
- B. B
- C. AB
- D. O
Explanation
Option D is the correct option because people with type O blood are called universal donors because their donated red blood cells have no A, B or Rh antigens and can therefore be safely given to people of any blood group. Option A is incorrect because blood group A has antigen A present on it so can only donate blood to Type A and AB. Option B is incorrect because blood group B has antigen B present on it so can only donate blood to Type B and AB. Option C is incorrect because blood group AB has antigen AB present on it so can only donate blood to Type AB.
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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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