Not sure if any of this is useful...From "Peafowl 201: Further Genetics"
https://www.backyardchickens.com/t/...enetics-colors-patterns-and-more#post_4731442
Split Colors
To understand what a 'split' bird is you have to have a grasp on what it means to carry a color. A carried color is a color the coding for which exists in the bird genotypically but is not displayed phenotypically. In order to display one of the color mutations, two copies of the mutation must be present.
The only alleles (variations) which are known to exist (meaning the only two bits of coding which replace one another on a chromosome because they code in the same place) are White and Pied.
Namely what you will see in birds is blue split to other colors. Blue split to White, Blue split to Purple, Blue split to Bronze, etc. This is because it takes 2 of any color code to make the color display, and having only one (ie, split to the color), will default the bird to the wild type blue coloration.
The only color change in a split bird occurs when the bird is split to white (or silver pied). In this case, the bird will show white wing coverlets/primaries
An explanation of Patterns
The pied pattern is actually a result of leucism (pigment is not deposited on the feathers properly). In birds, this can be displayed as
pied (meaning there are patches where the pigment is unable to display), resulting in white patches over the bird. As pied is a result of pigment deposition and not of pigment absence,
the patches of white will be located in different areas on each bird depending on where pigment deposition is inhibited on an individual bird. The pied pattern has nothing to do with the white color allele and cannot be obtained through breeding a wild type to a white bird.
Mechanics of the 'White' Color and Pied Pattern
Partial leucism results in the pied coloration; total leucism can result in a completely white bird, which is how we have white peafowl. Because leucism is a failure of the color to be put into place, not a failure of the color to exist, it is possible for white birds (and pied birds) to exist with other colors and other patterns. A white bird may also be genotypically a purple bird, or a bronze bird, but the 'white' would mask these colors completely because the pigment for them would not be deposited on the feathers.
A white bird cannot also be a pied bird, as the pied gene is an allele for the white gene. A bird cannot be both a partial leucistic bird (pied) and a total leucistic bird (white) at the same time. It is also true that a total leucistic bird will never revert to partial leucism, meaning a white bird will never create a pied bird offspring.
In this sense, white and pied are not truly colors or patterns; they are the masking of color and the interruption of patterns.