The character in this case is an inhibitor of tail development.
On account of this weakness of the inhibitor in the germ-plasm of No. 117 that inhibitor is rarely fully activated.
Even in the DR's the inhibitor may sometimes work itself out.
In this case we may conceive that an unusually potent condition of the inhibitor wholly stopped the development of the tail.
Such birds being heterozygous for the inhibitor factor, should be whites showing some coloured "ticks."
Probably we ought to regard the beardless as a bearded wheat in which there is an inhibitor that stops the beard from growing.
The Silky is pure for the pigmentation factor, but does not contain the inhibitor factor.