Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Formation of amplifications in unstable revertants Most unstable revertants are initiated by pre-existing cells that carry multiple copies of a plasmid with a tandem duplication of the mutant lac region. Other duplications may form under selection during transfer between standard initiator daughter cells. Transfer of a duplication-bearing plasmid provides conditions for unequal recombination that can expand the tandem array of lac copies.
