When a foreign $DNA$ is introduced into an organism,how is it maintained in the host and how is it transferred to the progeny of the organism?

(N/A) $1$. The foreign $DNA$ is ligated to a vector,such as a plasmid,which contains an origin of replication $(ori)$.
$2$. This recombinant $DNA$ is introduced into the host organism.
$3$. Because the plasmid has an $ori$ sequence,it replicates independently within the host cell,ensuring the maintenance of the foreign $DNA$ as the plasmid makes multiple copies of itself.
$4$. When the host cell undergoes division,the replicated plasmid $DNA$ (containing the foreign gene) is distributed into the daughter cells,thereby transferring the foreign $DNA$ to the progeny.