to go on with the
SECOND GROUP: COLOUR GENES WHO CHANGE THE UNIFORMITY OF THE TOTAL COLOUR
-I (Dominant White) Autosomal incomplete dominant. Fades pheomelanin when homozygous, but not with one dose.
-ID (Dun) Autosomal incomplete dominant. One dose darker than two doses. Allelic to I.
-IS (Smoky) Autosomal both dominant & recessive. Changes eumelanin- black to smoky shade. Allelic to I.
-choc (chocolate) Sex-Linked, recessive. Changes black-eumelanin to a chocolate-brown shade. Allelic to I.
-c (recessive white) Autosomal recessive. Obstruct both pheomelanin & eumelanin to white.
-S (Silver) sex-linked gene changes most of the pheomelanin (gold-red) of the wild phenotype to silver-white, except for the salmon breast of the e+/e+ hens. This gene is incompletely dominant in the males.
-Bl (Blue) Autosomal incomplete dominant. Heterozygous= Blue, Homozygous= Splash
-lav (lavender) Autosomal recessive. Diluter of eumelanin and also dilutes pheomelanin.
-mz (recessive black).
-rb (mat (not shining) black).
-Cb (Champagne Blonde) dominant, might have a close linkage with Columbian.
-ig (Inhibitor of Gold - Cream) recessive, no effect on eumelanin, generally males show a greater dilution of pheomelanin than females.
-Cha (charcoal) Both Melanotic & Charcoal genes were identified as different, by using linkage relationships. They are both on the same chromosome, but different distances to other known loci (eg P) on the same chromosome.
[Modificato da Danny_57 10/01/2009 16:16]