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Question

The equivalent of a structural gene in a true breeding plant is

A
recon
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B
muton
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C
cistron
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D
operon
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Solution

The correct option is C cistron
Cistron- segment of DNA which determines the synthesis of the complete polypeptide. Thus, it is considered as equivalent to a structural gene. Eukaryotic structural gene is monocistronic whereas prokaryotic structural genes are polycistronic.

Muton- Smallest unit of DNA in which mutation occurs.

Operon- Functional unit of genomic DNA containing a cluster of genes under control of single promoter.

Recon- Smallest unit of DNA for recombination.

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