The Gene Splicing Machine is described as 'the primary way to find new species' of norn. It allows you to select two norns. The Machine will then take a seemingly random selection of genes, half from the mother, and half from the father, and allow you to preview the norn's appearance. You may then selectively swap in genes from the mother or father, and the appearance of the hypothetical norn changes accordingly.
Splicing costs bioenergy, and takes a certain amount of time. You may also splice in genes from other norn breeds, but this will cause the splicing to take longer. Genetic samples from different norn breeds are unlocked with the levelling system. When the egg is spliced, it appears in the Hatchery Machine.