Single Comb => p+p+ r+r+ d+d+ Bd+Bd+
In Silkies, we know the combs are formed by a combination of two genes Rose- and Pea, PPRR or PpRR or PpRr or PPRr producing similar but not exactly the same phenotype combs
Rose Comb => p+p+
RR d+d+ Bd+Bd+
Pea Comb =>
PP r+r+ d+d+ Bd+Bd+
Walnut (Pea & Rose combed) =>
PP RR d+d+ Bd+Bd+
In Breda males, two small papillae on each side of the median line back from the upper beak indicate the duplex condition, although the birds appear practically combless
Duplex- V Shaped => p+p+ r+r+
DvDv Bd+Bd+
Breda - combless => p+p+ r+r+
DvDv bdbd
Horned Caltanissetta => p+p+ r+r+
DvDv ?Bd+Bd+?
?? what causes the extreme horns ? Could have todo with an
overmastering* effect of Livorno single combs ! So their could be a single combed underneath !!!
*(A kind as in the Exchequer which have an overmastering effect of the Dominant white gene of the Livorno
without it is being present in combination with the absence of Melanotic !!)
Genotype Exchequer : E/E S/S*S/- mo/mo
i+/i+ ml+/ml+
[Modificato da Danny_57 21/06/2012 11:12]