Genome
and
Plasmon
The total hereditary material may be divided into the genome and the plasmon. The genome is the hereditary material of the chromosomal complex. The plasmon is the total hereditary material outside the chromosome.
The term plasmon was introduced by Fritz von Wettstein in 1924. The smallest heritable unit of the plasmon is the plasmagene,a term introduced by Darlington in 1939. Plasmagenes are known by different names according to their location in different cell structures.





