A solid white cat is created by a completely separate gene than the white marking one. The ‘White’ gene is highly dominate and masks all other genetic possibilities in cats. This means:
The White Gene
WW: A (Homozygous) White cat
Ww: A (Hetrozygous) White cat
ww: A Non-white cat
Breeding
Homozygous White (WW) x Homozygous White (WW)
| W | W | |
| W | WW | WW |
| W | WW | WW |
Homozygous White (WW) x Hetrozygous White (Ww)
| W | W | |
| W | WW | WW |
| w | Ww | Ww |
50% white kittens carrying non-white
Homozygous White (WW) x Non-white (ww)
| W | W | |
| w | Ww | Ww |
| w | Ww | Ww |
Hetrozygous White (Ww) x Non-white (ww)
| W | w | |
| w | Ww | ww |
| w | Ww | ww |
50% non-white kittens carrying non-white.
Non-white (ww) x Non-white (ww)
| w | w | |
| w | ww | ww |
| w | ww | ww |