The terms cistron, recon and muton were proposed by

The correct option is A
Johannsen
Cistron

• Cistron is a part of a gene that codes for a 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.

Muton
Muton is the element of the DNA that is capable of undergoing mutation easily.

Johannsen
Johannsen proposed the terms cistron, recon and muton.

Final answer:

a. Johannsen