Mention any two methods of introducing allen DNA into the host .

Explanation

Recombinat DNA and the bacterial cells are incubated in ice, followed by placing them briefly at 42oC ( heat shock ) and then putting them back in ice .
By microinjection the recombinant DNA directly injected into the nucleus fo the animal cells .
Plant cells are bombarded with high velocity micro - particles of glod or tungsten coated with DNA in a method Known as biolistics or gene gun .