Correct Answer: A
Solution :Cistron or functional gene or gene in real sense: Benzer (1955) coined the term cistron. Cistron is that particular length of DNA which is capable of producing a protein molecule or polypeptide chain or enzyme molecule. Muton or unit of mutation: Muton is that length of DNA which is capable of undergoing mutation. Muton is having one or two pairs of nucleotide. Recon: Recon is that length of DNA which is capable of undergoing crossing over or capable of recombination. Recon is having one or two pairs of nucleotides. Operon: Operon is the combination of operator gene and sequence of structure genes which act together as a unit. Therefore, it is composed of several genes. The effect of operator gene may be additive or suppressive. Hence, the correct option is [a].
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