Here is a diagram showing the breeds of the original genomes.
Every hatchery egg has a mum# and dad# genome as parents.
Mostly they are identical apart from their pigmentation and appearance genes.
The exceptions are mum3 and dad3, as Purple Mountain norns, they have an twelve extra or modified genes.
Go here for more details of PMN genetics.
The gren genome is used for all grendels that come from the Grendel Mother (egg machine).
Go here for more details of grendel genetics.
test genome was probably used to test out the game during development.
In cheat mode you can add test norns, they use this dDNA.
The only difference between this and the mum# and dad# genomes is the lack of the gene that reduces hunger.
This could eventually kill the norn by not providing any reward for eating.