Genetics for ameraucanas

[nicalandia]

Quote:
As you mentioned other loci can affect shank color expression, in case for Ameraucanas the E-locus can have a profound effect on shank pigmentation, Autosomal Extended Black(E/E) and Birchen(ER/ER) alleles can enhanced the pigment to the point of making them black, the wild type e+ allele and recessive eb have a normal dermal expression, but eWh(Wheaten) has a detrimental effect, eWh will not inhibit the dermal pigment expression but it will reduce the amount quite a lot.

 

[nicalandia]

I am glad that we have someone very knowledgeable among our young ranks, but I would like to expand on your post.

Ameraucanas specifically have the Dominant Wild Type White Skin color: W+, Capital letter to assert the dominance and the + sigh to assign it’s wild type nature, reecessive sex linked dermal melanin gene(id+/id+ for males and id+/- for females).

Ameraucana breeders working on the Barred/cuckoo Ameraucana project face two major obstacles the linkage of sex linked Id and B(Dermal Inhibitor and Barring are linked by 13 map units), and while Id-B linkage can be overcome by recombination (13% chance of recombinants), Barring on it’s own is a powerful melanin and pheomelanin inhibitor.