DNA replication studies in genus Vicia through fibre radioautography

An experiment has been conducted to study the mode of replication in 3 species of Vicia having different C-values by means of fibre radioautography. Characteristics of the units involved in DNA replication of these species have been compared. It has been observed that replication occurs predominantly through bidirectional chain growth, replicating units are arranged in tandem, and replication proceeds from the point of origin in both directions. It has also been shown that there is a positive, though not proportionate, correlation between replication rates, the sizes of replication units and C-values.