The correct option is D Cistron
Muton
Muton is the element of the DNA that is capable of undergoing mutation easily.
Cistron
Cistron is a region of a DNA that codes for a specific polypeptide.
In prokaryotic cells, it is made up of exons (coding segments). In eukaryotic cells it is made up of both exons and introns (non-coding segments).
Recon
Recon is the unit of recombination present on the DNA.
Operon
Operon is a coordinated group of regulatory and structural genes that function together as a unit to control the formation of protein.
Final answer
(B) Cistron