My chocolate gene was derived from an outcross to an English Bantam Chocolate Orpington from Marc Sacre. At this point the eggs I'm selling are out of a split to chocolate rooster (Rolo) over blue rocks, blue barred rocks, and a black rock.
Genetic considerations: 1) The chocolate gene is sex-linked and recessive. Only the female offspring have the potential to have a chocolate phenotype. 2) The barring gene is sex-linked and dominant. 3) The blue phenotype is a heterozygous genotype. Homozygous black and homozygous splash are also possible combinations.
The birds currently in the Project House include:
* Barred rooster split to Chocolate
* Black Rock pullet
* Blue Rock Project hens & pullets
* Blue Barred Project hens & pullets
Outcomes from Split to Chocolate Rooster x Black Rock pullet
The chocolate gene is a sex-linked recessive trait. Males must need two copies of sex-linked traits in order for the presence of the gene to show. Therefore, some of the males may be carrying a copy of the gene but it does not show. Barring is a sex-linked dominant trait. Males only need one copy of the gene to appear barred but there will be errant solid feathers.
 
Outcomes from Split to Chocolate Rooster x Blue Rock pullet
All of the above plus:
     
Outcomes from Split to Chocolate Rooster x Blue Barred Rock hens
Both of the above sets of outcomes but the barred roosters will have 2 copies of the barring gene so the barring will be more consistent.
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