Mixing recessive and dominant traits

I finally understand all the traits by themselves but when mixing them I get confused again. What are the steps needed to take to get an albino spider? It is breed an albino to a spider then have the DH babies. Are all of the babies 100% DH? Then breed the two DH together to get a clutch with an albino spider right? What animals does the DHxDH consist of? Man an albino spider would be so sweet

You would breed spider X albino and then breed one of the spider het albino babies back to the albino!

I think it would be something like this, Breed a Albino to a Spider and the babies should be 100% Het Albinos and Spiders 100% het albino, then when the female spiders get old enough, breed them back to a spider het albino or a albino. Then you might get an albino spider.

I think thats right but if not then I know someone will correct me and I need to read more about genetics :P

dang im too slow at typing lol :grabbed:

Yep.

Spider is dominant so you can't tell a het from a homozygous spider. This means that a spider could only carry one copy of spider and it would appear exactly the same as a homozygous spider.

SO.. if you breed a spider to an albino and your spider is a het, you will get roughly half of the babies that are het spider (which do look spider since it's dominant) and all of them are het albino. SO.. breed any of them that is a spider spider back to an albino, and you will get half that are albino and half of those albinos could also be spiders. I'm not sure of the odds that any given egg has both mutations (too much math for this time haha) but there is the chance.

Now.. if your original spider is a homozygous spider (this is only possible if BOTH of it's parents are spider.. and it's still not for sure) then ALL of the babies that this snake produces are spider. If it's bred to albino, all those babies are HET spider (remember still looks spider)

I really hope that makes sense. :)

Wow I guess I was way off with the double hets. I guess those are only with recessive x recessive. Still sounds really complicated to me, i'll read it a couple more times :)

Spider bred to albino IS double het (the ones that appear spider are anyway, the ones that appear normal are only het for albino)

Here's my explanation since I will be doing this next year.

I will be breeding a pastel (dominant) to a hypo (recessive). Hopefully I will get pastel het hypos from the breeding. Pairing up a pastel het hypo with another pastel het hypo will give a clutch hopefully containing hypo pastels. Hypo pastels would show both the dominant and recessive traits.

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Originally Posted by Shelby

if you breed a spider to an albino and your spider is a het, you will get roughly half of the babies that are het spider (which do look spider since it's dominant) and all of them are het albino. SO.. breed any of them that is a spider spider back to an albino, and you will get half that are albino and half of those albinos could also be spiders. I'm not sure of the odds that any given egg has both mutations (too much math for this time haha) but there is the chance.

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The probability of a spider albino resulting from a cross of a Spider het albino (SsAa) to an albino (ssaa) is 25% (.5 x .5=.25).

Like shelby said....
The easiest way to start the process is to cross an albino to a spider. Take the Spider offspring from this cross, which will all be hets for albino, and breed them back to the orginal albino parent (this is called a backcross).

If you draw the punnet square, there are four possible types of offspring from the backcross.....A Spider,An Albino Spider, A het albino, and an albino.

Hope this helps...

Food for thought...

It took us 3 tries before hitting the Spider-Albino. Whiffing happens!!!! And it SUCKS!!!!

So, after the first 2 complete whiffs,

1st time actually producing them: SpihetAlbinoxAlbino - 5 eggs, 5 albinos, 1.1 Albino Spiders.

2nd time around: SpihetAlbinoxAlbino - 5 eggs, 5 spiders, 1.1 Albino Spiders.

Last year, well, if we top it this year, no complaints. ;)

K~

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Originally Posted by SPJ

Here's my explanation since I will be doing this next year.

I will be breeding a pastel (dominant) to a hypo (recessive). Hopefully I will get pastel het hypos from the breeding. Pairing up a pastel het hypo with another pastel het hypo will give a clutch hopefully containing hypo pastels. Hypo pastels would show both the dominant and recessive traits.

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You'd also might get a hypo super_pastel. Your chances are 1 out of 16 or 6.25% for the hypo_superpastel.

Your theoritical chances for the hypo_pastel are 1 our of 8 or 12.5% when doing a sib cross of pastel het hypo.

You'd double your chances of producing a hypo_pastel by doing the backcross technique described above. Take a Pastel het hypo offspring and breed it back to the original hypo parent. However, you cant get any super_pastel hypos from this cross.....

Another advantage of the backcross technique is that it can sometimes be used if you get a clutch consisting of only one sex.

For example....


Lets say in the parental generation you had a pastel male and crossed this to a hypo female and you got 4 eggs and all were male--you cant do a Double het sibling cross. But you could cross any of the four offspring males back to their mother and have a 1 in 4 chance of producing a hypo_pastel. Now if you had the same parents and all 4 were female then you'd just be unlucky......

This is just theory....I dont see any reason why it would be hard to backcross in ball python......but since I never actually tired it....who knows.... maybe an experienced breeder will chime in with an answer

Perhaps ball pythons are like us and dont like to "hook up" with one of their parents? But I doubt it.....

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Originally Posted by Mendel's Balls

Perhaps ball pythons are like us and dont like to "hook up" with one of their parents?

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Doesn't matter to them.

-adam