However many alleles of a gene exist in a population, a diploid human individual can carry at most

  • A. one
  • B. two
  • C. three
  • D. four

Explanation

Each person inherits one allele from each parent, so only two can be present, one on each homologue. The ABO blood group has three alleles in the population, but any one person holds only two of them.

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