The phenotype of an individual may be affected if the modified allele produces

$(a)$ No enzyme at all
$(b)$ The normal/less efficient enzyme
$(c)$  $A$ non-functional enzyme

  • A

    Only $(a)$ is correct

  • B

    $(a)$ and $(c)$ are correct

  • C

    $(b)$ and $(c)$ are correct

  • D

    Only $(c)$ is correct

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  • [AIPMT 2012]