DYC or Dominant Yellowface
The Dominant Yellow Cheek is the only one, of the four cheek patch altered
mutations, that is truly dominant. It is co-dominant with the normal grey and
Dominant Silver mutations. Only one is needed to create visual chicks and it
cannot be carried as a split gene. The other three mutations are recessive so
therefore you need 2 parents that carry the gene.
In the DYC the red-orange psittacin of the face is affected. Which creates a wide
range of colors from light yellow to tangerine orange. They can be often
mistaken for PF, SLYC, and sometimes normal cheek. Because of this trait it can
be very difficult to determine, by sight, which mutation you have. Which is also
why SLYC and PF have been bred into the DYC.  If uncertain you will have to
do test breedings to figure out what mutation you have.  
Cheek patches can feather out in a beautiful yellow color then as the bird
matures and molts into the adult coloring, become darker. Typical cocks will be
darker than hens because of the underlying yellow of the face. Hens do not have
the yellow face of a cock, so the chance of keeping the light yellow cheeks is
greater.  This is strictly my own observation in my breeding program.
DYC can be single or double factored. Breeding 2 DYC's together will give you
single factored and double factored chicks. It is not recommend to breed with
the other cheek patch mutations or WF. It is still a fairly new mutation and to
stablize or set the traits we need to breed it simple, keeping back the birds with
the best yellow cheeks to use for breeding. The photos below give some of the
cheek color variations.
DYC Chicks
DYC Hens
DYC  Cocks
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