Originally Posted by gayef
Tonka is a Blue Point carrying chocolate and lilac and Lexus is a Seal Point carrying lilac. From what I understand of the color genetics, they should be able to produce all four self-colors, however, they have produced only Blue Points and Seal Points to date. Maybe someone here can correct me if I am wrong about being able to produce chocolate and lilac.
A blue-point can produce chocolate and lilac-points if it carries chocolate. A seal-point can produce lilac if it carries chocolate and dilute.
So if you are correct about what they carry, their genotypes are Bbdd (Tonka) and BbDd (Lexus).
So, Tonka has a gene for Black (B), one for chocolate (b), and two genes for dilute. Lexus also has one for Black and one for Chcoclate, but she only has one gene for dilute (d) and it's masked by the dominant normal version (D).
What colours could they produce?
Both are Bb, so offspring are BB (Seal), Bb (Seal carrying chocolate), bB (Seal carrying chocolate) and bb (chocolate).
One is dd and one is Dd, so here you have Dd and dd as the possibilities - half dominant and half dilute. The version of D/d they inherit from Lexus is the key.
So overall you need 8 babies to represent all the possible outcomes:
BBDd - Seal carrying dilute
BbDd - Seal carrying chocolate and dilute (Seal from Tonka, Chocolate from Lexus)
bBDd - Seal carrying chocolate and dilute (Chocolate from Tonka, Seal from Lexus)
bbDd - Chocolate
BBdd - blue
bBdd - blue carrying chocolate
Bbdd - blue carrying chocolate
bbdd - lilac
So, 3/8 of the kittens should be seal, 3/8 blue, 1/8 chocolate and 1/8 lilac. Big emphasis on *should* - my friend bred colour-point british shorthair and several matings that should have produced a lilac self never did!
I don't know how many kittens these two have produced, nor have I seen their pedigrees. Have either ever produced a chocolate or lilac kitten in another mating? Have either ever mated with a chocolate or lilac? That means you should get 1/2 seal/blue and 1/2 chocolate/lilac.