Choose the correct option with respect to the genetic makeup of the ABO blood grouping system in humans.
- A4 Alleles, 4 phenotype and 6 genotype
- B3 Alleles, 6 phenotype and 4 genotypes
- C4 Alleles, 6 phenotype and 4 genotypes
- D3 Alleles, 4 phenotypes and 6 genotypes
✓ Correct answer: D
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