Another thing we need to learn a little bit
about before we can move forward is the fact
that bacteria like to pick up DNA from their
environment. Unless us where we can have crossing
over and exchange of genetic information.
Bacteria will obtain genetic information from
their environment. In order to do that, they
have to be okay with picking it up. It is
just one of the mechanisms for them to obtain
genetic variation, but it is one that they
use pretty frequently. The point is they like
to pick up DNA from their environment. This
can happen in a couple of different ways.
We could have the bacteria picking up DNA
fragments from the environment may be from
other dead bacteria or other sources altogether
and then we can have them either pick it up
and incorporated into the chromosome or they
could pick it up and not really interested
in that DNA and chop it into pieces and move on.
If they pick up that DNA, we have a genetically
modified bacterium. They may also pick up
plasmids from the environment or they may
pick up fragments of DNA and incorporate them
into plasmid. It could either be incorporated
into the bacterial chromosome or the plasmid.
We utilize this desire of bacteria to pick
DNA from their environment to modify a plasmid
and ask it to pick up the plasmid from the
environment. In that way we can transfer DNA
from one organism to another organism.
We can genetically engineer things.