Someone has already made comment on this and I thought I would take time to explain how it works.
The Dilute (white) colouring is due to a recessive gene
If you are unsure what this means then Ill briefly cover the Biology 101 on this subject.
In order for a recessive gene to manafest as a characteristic the chip must inherit a pair of dilute genes, one from both of its parents, which in turn means that both of its parents must either be dilute, or be agoti and carry the recessive gene.
Each parent passes on one of its pair of genes, the chances of which one is 50/50.
If the parent is a dilute then you know that because the chip is dilute then its got a matched pair of dilute genes, and therefor there is a 100% chance that that chip will pass on a dilute gene to its offspring.
However, if the chip is agouti, then unless you know its parentage or know what sort of colouring you can breed from it then you you dont know what its gene makeup is. ie if one of its parents was dilute or any of its offspring are dilute then you can be sure it has one dilute and one agouti gene.
Its possible to breed dilute chips from a pair of agouti chips provided both parents are carriers of the gene, in such cases you should expect 1/4 of the young to be dilutes, a further 1/2 to carry the gene, and the last 1/4 to be pure Agouti.
Should you breed a dilute with an agouti then you should expect either all agouti but carrying the dilute gene (in the case that the agouti parent has two agouti genes), or 50% dilutes and the other 50% agouti but carrying the dilute gene.
