Cats
The
terminology used differs from the Grades 1 - 9 of the cat fancy; 90% white with a lot of
random spots is referred to as Level 15. Selective breeding has isolated most of the white on
the cats to a single layer of white. She can now produce solid coloured cats from the mating
of two bi-colours/pied/vanish cats. In addition, all of her best breeding cats have black feet.
Breeding experiments involved mating a level 15 stud to a solid black, two Level 7 piebalds,
and a Level 9 cat. A cat with a large degree of white is most probably homozygous for the
white spotting gene and mating it to other white-marked cats which also carry at least one
white spotting gene should not, in theory, produce solid-coloured cats. An alternative
hypothesis is that the cats have the dominant white gene (the one related to deafness) and that
a second gene is causing this to break down so that spotting appears. It is possible to produce
annaabi.ee 
