The Si Locus has two different alleles in it: ‘Si’, and ‘si’. ‘Si’ is the most dominant and ‘si’ is the most recessive.

Si: Non-Silver
si: Silver

NON-SILVERED
The ‘Si’ allele is the Non-Silvered allele. All varieties that are not silvered must have at least one of these alleles. If they have two of these alleles, then they are homozygous (Meaning it is “pure” for that allele, so that it cannot produce anything recessive to it no matter what it is bred to) for Non-Silvered. The following varieties have the Black allele:

Non-Silvered can carry Silvered. However, carriers sometimes have light silvering.

SILVERED
The ‘si' allele is the Silvered allele. All Silvered colors must have at least one of these alleles. Any base color can have silvering, though it cannot be seen on white rabbits. Heavy silvering is always from homozygous (sisi), while light silvering may be heterozygous (Sisi). Silvered rabbits start out as their base color, with no silvering. As they mature, they get more silvered. Silver Fox, Champagne D'Argent, Argente Brun, Creme D'Argent, and Silver all have silvering.