I though I'd write a quick giude to Co-dom genetics to help some people along.

Fist is understanding that Co-dom genes themselves can be Co-dom or recessive to other genes in their locus. With BP we to this point have only delt with Co-dom/co-dom genes.

Example

Pastel Co-dom to normal

both genes are expessed in this locus, giving us a Pastel when two pastel genes are present there is no interfering coloration from the normal gene so the effect is a Super Pastel.


now for a more advanced example I turn to cornsnakes yet again.

Here we deal with Three alleles(genes) that can share the same locus.

Monty is recessive to Normal
Stripe is recessive to Normal
Montly is dom to Stripe

The montly or striped genes alone are recessive and act as such alone.
But they share the same locus and thus are co-dom.
A snake carring one Monly and one stripe gene will show as montly because no normal gene is present and montly is dom to stripe.