Which form of genetic engineering was used by humans for many years before the discovery of DNA?
A: gene insertion
B: gene splicing
C: animal cloning
D: selective breeding
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according to wikipedia, Genetic Engineering Genetic engineering is the process of using recombinant DNA (rDNA) technology to alter the genetic makeup of an organism. Traditionally, humans have manipulated genomes indirectly by controlling breeding and selecting offspring with desired traits.