>Hi - I just purchased a pair of 100% het ghosts and am planning on purchasing a pastel...so my mind naturally turned to the possibility of someday producing a ghost/hypo pastel. I've been playing with the genetics, and now I have come to a question. I'm familiar with 50% hets, 66% hets, and 100% hets - but can you have a poss. het with a percentage smaller than 50%? (I know you can, but is it worth advertising the snake as such?)
I don't think it's worth advertizing the snake as such.
> I calculate that if I breed two pastel het ghosts together (not super pastels, just pastels, referred hereto as "het pastels" for simplicity; I know there is no true "het pastel"
,
Beg to differ; there is a true "het pastel". Heterozygous merely means that the snake has a pastel mutant gene paired with a normal gene. Pastel ball pythons fit the definition. The nice thing about a codominant mutant gene is that we can look at the snakes and say that this is a homozygous normal, that is a heterozygous pastel, and the other one is a homozygous (AKA super) pastel.
> I get these numbers:
>6.25% WT
>12.5% het ghost
>6.25% ghost
>12.5% pastel
>25% pastel het ghost
>12.5% pastel ghost
>6.25% super pastel
>12.5% super pastel het ghost
>6.25% super pastel ghost
Agreed.
>so basically, I have a 1-in-16 chance at the super pastel ghost (like getting a snow from two double het snows). What percent possible het ghost would the normal looking offspring be? The pastel offspring? The super pastel offspring? I'm also posting this in the morph forum, but thanks in advance for any enlightenment!
All non-ghost babies from this mating are 66% probability heterozygous ghosts. The easiest way to figure that out is to do a Punnett square for a pair of heterozygous ghosts. Statistically, 75% of all the babies are not homozygous ghost, and 50% of all the babies are heterozygous ghost. 50%/75% = 2/3 = 66% of the non-ghosts are heterozygous ghost.
Or you could do it the hard way:
25% of all babies are super pastels.
18.75% of all babies are super pastel and not homozygous ghost.
12.5% of all babies are super pastel and are heterozygous ghost.
12.5%/18.75% = 2/3 = 66% of the super pastels that are not homozygous ghosts are heterozygous ghosts.
25% of all babies are not pastels (either homozygous or heterozygous).
18.75% of all babies are not pastels and not homozygous ghost.
12.5% of all babies are not pastels and are heterozygous ghost.
12.5%/18.75% = 2/3 = 66% of the non-pastels that are not homozygous ghosts are heterozygous ghosts.
50% of all babies are heterozygous pastels.
37.5% of all babies are heterozygous pastel and not homozygous ghost.
25% of all babies are heterozygous pastel and are heterozygous ghost.
25%/37.5% = 2/3 = 66% of the heterozygous pastels that are not homozygous ghosts are heterozygous ghosts.
I love cut and paste. 8-)
Paul Hollander
