If
F
+
and
F
-
cells are grown in a Davis
U-tube
which allows mixing of the medium but not of the cells, no
prototrophs
are recovered.
Therefore physical contact is needed for
conjugation
and genetic
recombination
.
If F+ and F- cells are grown in a Davis U-tube which allows mixing of the medium
but not of the cells, no prototrophs are recovered.