MN blood group system is an example of:
Correct answer: D. Co-dominance
- A. Complete dominance
- B. Incomplete dominance
- C. Overdominance
- D. Co-dominance
Explanation
The MN blood group system is an example of codominance, where both alleles (M and N) are equally expressed in the phenotype of heterozygotes. Individuals with the MN blood group express both M and N antigens on the surface of their red blood cells. In contrast, complete dominance would result in only one allele being expressed, incomplete dominance would result in a blend of traits, and overdominance would result in a phenotype that is more extreme or advantageous than either homozygous form, none of which describe the MN blood group system.
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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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