Moderate

The most popularly known blood grouping is the ABO grouping. It is named ABO and not ABC, because "O" in it refers to having:

Correct answer: C. No antigens A and B on RBCs

  • A. Overdominance of this type on the genes for A and B types
  • B. One antibody only ­ either anti ­ A or anti ­ B on the RBCs
  • C. No antigens A and B on RBCs
  • D. Other antigens besides A and B on RBCs

Explanation

In ABO blood group, O refers to O blood group. It has no antigen (A and B) on RBCs.

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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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