a combination of two separate homozygous recessive morphs is just that. They are completely independent of each other because they are at different loci.

A snow is a snow because:
a) albino removes all the black
b) anerythristic removes all the red

Thus snow in itself cannot be described as 'recessive' because the phenotype is a combination of the two single traits. The same can be said for a combination of any non allelic combination morphs.

The only time a third phenotype is produced is when an animal is heterozygous for two morphs that are at the same allele. An example:

wibble is recessive to normal
wobble is recessive to normal
wibble and wobble are co dominant to each other

possible genotypes/phenotypes would be:

het wibble looks normal
het wobble looks normal
homo wibble looks different to normal and wobble
homo wobble looks different to normal and wibble
het wibble and wobble looks different to normal, wibble and wobble

....i hope all the wibbles and wobbles aren't too confusing :S

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