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🧬 Dominant & Recessive: What Does That Mean?
  • In the ABO system, there are dominant alleles and recessive alleles:
    • The alleles A and B are codominant. This means both features are fully expressed in the genotype AB – that person has blood group AB.
    • The allele 0 is recessive. It only appears in the blood group if both inherited alleles are 0 (genotype 00).
  • Examples:
    • A parent with genotype A0 can pass on either A or 0.
    • A parent with genotype B0 can pass on either B or 0.
  • The expression of the blood group can be clearly explained by dominance and codominance.
  • ⚙ dominant
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