Platty Daddy Solution

[colemaj]

If the platty daddy special gene is located on the X chromosome, Ralphs results make sense. It would also mean that it's a recessive gene(or genes). Think bout it this way.. Large X's will indicate normal genes, little x's will be recessive

Pladdy Daddy X Normal Mother
xy * XX

YX, xX are your two possible out comes, neither would express the trait, but if you bread platty daddy back to one of the normal looking off spring you'd get

xy * xX

and you'd get

yx, xx, Xy, Xx, so you'd see .25 percent male platty Daddy, .25 percent female platty daddys and then normal males and female het platty daddys.

Does this make sense? It it's a sex-linked trait you'd get the results he's seeing. I don't know a whole lot about it but I figured this might be a possible explanation.

edit: It may not be officially XY for reptiles, I'm trying to find out what the sex chromosomes are called, I'll add it if I have any luck.


I emailed this to ralph to see what he thinks. Hopefully this is right and we can make many more of those gorgeous snakes.

[colemaj]

I talked to ralph, it's not sex-linked... but does anyone know of sex-linked traits that are similar to above with balls?

[soy.lor.n]

yx, xx, Xy, Xx, so you'd see .25 percent male platty Daddy, .25 percent female platty daddys and then normal males and female het platty daddys.

Just to clarify (I'm not sure which you meant, I just know I read it the wrong way at first, so I thought I'd clear it up for anyone else that comes in) the "normal" girls will be het for platty and the normal males will actually be normals, not carriers

[Monty]

why would only the females have the trait and not the males

[Gloryhound]

The platty daddy project is an interesting one and as soon as I get the cash together I plan to buy a female and male lesser and a normal female that came directly from the origional platty daddy.








Of course this is if the wife will let me!

[soy.lor.n]

why would only the females have the trait and not the males

You mean in reality? I don't know much about the platty daddy situation. (I read a thing about it, but I was a little bit confused...He seemed very excited while writing about it LOL)
In sex linked traits, they're usually more common in boys than girls because even though it's recessive, the boy only needs one gene (on his X chromosome), because it isn't paired up with a gene on the Y chromosome. The girls on the other hand, need the recessive allele on BOTH X chromosomes.
You know the deal with the Y chromosome, right? It's just a deformed version of the X chromosome that's missing some of its genetic material, so if you were ever curious whether boys or girls were genetically superior, rest assured, it's us girls

[Gloryhound]

so if you were ever curious whether boys or girls were genetically superior, rest assured, it's us girls

Or do girls just have extra baggage!

[soy.lor.n]

Or do girls just have extra baggage!

[RandyRemington]

Snakes have the same gender chromosomes as birds, designates Z and W. They are opposite from mammals in that it's the female that has the mismatched pair and determines the gender of the offspring:

ZW = Female
ZZ = Male

I'm not aware of any identified sex linked mutations in ball pythons yet but of course we have them in chickens so maybe will find one in ball pythons eventually. I was wondering about the banana mutation as for years there where only females reported but I understand a male was eventually hatched and the mutation does look a lot like the white smoke from another breeder who I think founded with a male.

RDR's platy producing breeding results are consistent with the hidden/special/dilute mutation that when added to lesser makes a platy just being another mutation of that same gene. The twist is that this mutation doesn't seem to have a visible effect when paired with the normal version of the gene or even when homozygous. It's only effect seems to be to dilute lesser or butter into a platy when paired together or when paired with phantom to make the phantom 44. Presumably it might well dilute mojave also but there are so few people with this gene I don't know if that has been tried yet.

Here is a list of the RDR breeding record clutch numbers with Platy production if you want to test your sex linked theory against them:

2003: 44, 51
2004: 8
2005: 5, 42, 71
2007: 7, 12, 22, 29

[soy.lor.n]

Snakes have the same gender chromosomes as birds, designates Z and W. They are opposite from mammals in that it's the female that has the mismatched pair and determines the gender of the offspring:

ZW = Female
ZZ = Male

In that case, are sex linked traits more common in females than males, or is it a completely different deal (in birds, at least)?