100% het - How To?

[mapleman]

Hi guys,
I did read the sticky in the morph/genetics section which touches on this subject a little, but I'm still unclear on a few things.

Exactly how does one go about producing offspring that is 100% het for a recessive gene? And does the sex (m/f) of the parent play a role in the percentage?

Case in point - I have a male pastel ghost. I would like to be able to produce morph females 100% het for ghost (like mojave, cinnamon, etc) to be able to use to try and produce ghost versions of those morphs.

Thanks in advance for the help. This place is a great resource!

Lee

[PythonChick]

To produce an animal that is 100% heterozygous for a recessive trait you should breed an animal that is a visual carrier of that recessive trait to another animal.

Example 1: Breed you Male Pastel Ghost to a Normal-
All offspring are 100% Heterozygous, because you know your male Pastel Ghost passed down one copy of the ghost gene. This means all offspring are 'hets' for Ghost since they are carriers of the trait.
So from this breeding you would get Pastels and Normals all 100% Het for Ghost.
(This would work in the reverse situation as well, if for some reason you bred a female pastel ghost to a normal, so the sex of the parent doesn't really matter)

Example 2:Breed your Male Pastel Ghost to a Mojave-
Again, all Offspring at 100% Heterozygous, so you could produce Normals, Mojaves, Pastels, and Pastave's all 100% Het for Ghost (The normals would be called 100% Hets)

Hope this helps.

[Spaniard]

In order to get 100% hets you would need to breed a visual ghost to another animal. In your case it seems like you want codom females. This will give you offspring that are all 100% het for the recessive.

66% Hets you get by breeding two 100% hets together.

Breed a 100% het to an animal and all offspring will be 50% hets.

[mapleman]

Python Chick/Spaniard,

Thanks for the info!

Rich, if I understand this statement of yours correctly:

"Breed a 100% het to an animal and all offspring will be 50% hets. "

You mean that - say for instance - a 100% het animal bred to let's say a mojave would produce mojaves that are only 50% het, but a visual recessive (like my ghost) bred to that same mojave would produce mojaves that are 100% het, correct?


Thanks guys!

Lee

[WingedWolfPsion]

Use a punnet square.

Your orange ghost carries 2 ghost genes. We'll ignore the pastel for now, as it's irrelevent to this.
A het orange ghost carries 1 ghost gene, and 1 normal gene.

When you breed your orange ghost to any other snake, 1 orange ghost gene will be passed on, because the ghost doesn't HAVE a normal gene to pass on. The other gene will be contributed by the animal you bred it to--if that animals isn't an orange ghost or het, the gene contributed will be normal.

When a het is bred to any other animal, either 1 ghost gene, or 1 normal gene will be passed on--you don't know which, it's random.

So, if you want 100% het animals--this means ALL of the animals in the clutch WILL be het for orange ghost--just breed an orange ghost to anything.

If you want about 1/4 of the clutch to be orange ghost, 1/2 to be het for orange ghost, and 1/4 to be normal, breed 2 het animals together.
All of the animals that LOOK normal have a chance of being het, but you won't know which are which until you breed them. The chance is approximately 66% that any one of those normal looking animals will be a het, so they are called 66% hets--but of course, they either ARE or ARE NOT actually het.

Breeding a het to a normal will give you 1/2 normals, and 1/2 hets--1 normal gene may be passed, OR 1 het gene may be passed--it's random. The chance is approximately 50% that they will be hets--so they're called 50% hets.

More accurately, these animals are referred to as 'poss hets' --possible hets. The percentage just tells you how likely it is. When it comes down to it in the end, it's all still just a coin toss.

You cannot get a poss het by breeding your orange ghost to something, because he has no normal gene to contribute. His offspring will always carry at least 1 orange ghost gene. If the female also carries an orange ghost gene, they may carry 2 orange ghost genes as well, and will be ghosts.