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Ordinarily, the characteristics of biologic species are gradually changed by the slow process of evolution. During this process, the genetic integrity of evolving species is preserved by natural barriers that prevent the merging of hereditary characteristics from very dissimilar organisms. The barriers that interfere with the exchange of genetic material, or DNA, between unrelated species are poorly understood, but they appear to be of fundamental biologic importance.Recently, it has become possible to breach these barriers by experimental manipulation of genes and cells in ways that permit transfer of genes to a totally unrelated host1 2 3 4 5 6 7 8; hereditary material from virtually . . .
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Bleich et al. (1976) studied this question.
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