Question

What is the oldest form of biotechnology? selective breeding hybridization cloning recombinant DNA

Answer 1

the oldest form of biotechnology is : selective breeding
  biotechnology included all kind of efforts that we use to obtain a desired genetic result from the reproduction of a certain organism. In the early years of biotechnology, we still hasn't developed a way to do genetic manipulation, so we do selective breeding to obtain our desired result

Answer 2

The correct answer is selective breeding.

The selective breeding is a technique, in which the animals or plants of a desired trait is selected an bred, in order to obtain the desired trait in the progeny.

The technique of selective breeding is very ancient, even it was used by Mendel in his pea plant experiment. With the advancement in the techniques of biotechnology, hybridization, cloning, and recombinant DNA technology was developed.