The process of $DNA$ multiplication is called:

$A$ normal spontaneous rate for a single gene is one mutation in every ...... replications.

Self-replication occurs in

Given below are the two statements.
Statement $I$: In prokaryotes,there is only one replicon,however,in eukaryotes,there are several replicons in tandem.
Statement $II$: The two separated strands in a replicon of $DNA$ are prevented from rejoining by helicase enzyme.
In the light of the above statements,choose the correct answer from the options given below.

Heavy $DNA$ is separated from normal $DNA$ based on which of the following?

During $DNA$ replication,Okazaki fragments on the lagging template are always formed in $A$ direction $B$.