It is worth mentioning that the color and pattern morphs of Boa
constrictor are almost all crossbred animals. The same is also true
for "albino" Boa constrictor, so called "snowboas" or hypomelanistic
boas. Don't fall for somebody trying to tell you otherwise.
Another valid argument against the breeding of color and pattern
mutations is the fact that these aberrancies of the "normal" form
are nothing but genetic defects in the animals; hence the inheritability
of the aberrant patterns and colorations.
Speculations that the genetics of these animals contain further
defects are not easily dismissed, and the emergence of one-eyed
specimens among litters of albino boas in the U.S. certainly points
toward this as well. Such effects are then further strengthened,
as animals with the same genetic defects are bred with one another.
It is also notable that the breeding results of albino boas mating
with albino boas appear to be inferior to those of albino boas mating
with heterozygous specimens (animals that look normal, but carry
the genes for amelanism).