ISABELLE Mutation

It is not properly a mutation, but the result of the coupling of the tawny mutation with agate, that it will give to young males tawny and agate bearers, saying pass-partout, than later to coupled, for effect of crossing-over, will give recombined females. This mutation, acts on the eumelanina, reducing it lightly, exalting the parts white of the head, while the chest stretches beige. The mutation isabelle is of recessive sex-tied type.

In these couplings, the phenotype distinction of the bearers is possible only with the test of ulterior couplings.

ISABELLE MALE × ISABELLE FEMALE

ANCESTRAL MALE BEARER ISABELLE × ISABELLE FEMALE

ISABELLE MALE × ANCESTRAL FEMALE

ANCESTRAL MALE × ISABELLE FEMALE

ANCESTRAL MALE BEARER ISABELLE × ANCESTRAL FEMALE

COUPLING FOR ISABELLE MUTATION

First year

AGATE MALE × TAWNY FEMALE

OR

TAWNY MALE × AGATE FEMALE

The male resulting whit these coupling are called Pass-partout (P-P)

Second year

ANCESTRAL MALE BEARER ISABELLE (Pass-partout) × TAWNY FEMALE

Note: the phenotype of the males (ancestral and tawny) are not distinguish, tests of coupling can give one definitive answer.

BHEIND