The genetics of all recessive genes works like this:
A capital W represent normal colour (dominant colour) in a tiger and a small w represent white colour (recessive colour). A normal coloured orange tiger would be represented as WW and a normal coloured orange tiger carrying the recessive gene for the white colour would be represented as Ww
If the two normal colour orange carriers of the recessive white gene were bred to each other, the genetic representation would be: Ww x Ww. The offspring would be something like this: one-fourth WW, one-half Ww and one fourth ww.
Statistically, one out of four cubs would be a normal orange coloured non-carrier cub (WW), one-half of the cubs would be normal orange coloured carriers of the recessive white gene (2 x Ww) and one cub would be a double allele carrier of the white recessive gene (ww) and thus be coloured white.