Nobody is manufacturing organisms according to their genetic code. The genetic itself code is the means by which organisms develop and grow. Life began with strands of self replicating RNA.
For instance;
''...a pair of Scripps Research Institute scientists has taken a significant step toward answering that question. The scientists have synthesized for the first time RNA enzymes that can replicate themselves without the help of any proteins or other cellular components, and the process proceeds indefinitely.''
