With reference to the Mendelian experiments,which one of the following statements is $INCORRECT$?

  • A
    $A$ factor has only one allele.
  • B
    Recessive allele is not expressed in the presence of an alternative allele.
  • C
    The alleles occupy identical loci on homologous chromosomes.
  • D
    Allele is an alternative form of a given gene.

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