Polygenetic Recessive

[Halley]

I was looking at some of my Bell Albino hatchlings today and noticed that some have a decent amount of carrotting on their tail. This led me to wonder. Lets say I selectively breed my Bells to look like red tangerine (no tangerine lines breed into them, just 100% pure bell albinos) and then I breed this bell line to something totally different. Lets say a normal. Technically the traits I selectively breed for (tangerine) would be the trait of the bell albino, so if I breed a tangerine bell albino to a normal I would get 100% normals, that didn’t have a tangerine influence.

However is it possible for all the information, to rest all on one locus, or would the tangerine trait pass on? I would think there would have to be other things in play, but was just wondering what all of you thought, as I have not been able to reach a conclusion.

 

[StinaKSU]

The albino trait should not be linked to the linebreeding of the orange coloration....outcrossing a linebred orange albino *should* produce normals with an orange influence...but then if those offspring were bred back to the linebred animals you would get right back to the orange. The orange would not be produced by the albino gene.....it would be numerous other genes working together.......the animals would just happen to also be albino if you chose to use only albinos

 

[Halley]

The albino trait should not be linked to the linebreeding of the orange coloration....outcrossing a linebred orange albino *should* produce normals with an orange influence...

Actually what I meant is if you didn’t outcross to a line breed tangerine. I meant breeding the bells with no other influence to become tangerines themselves. Meaning, reddest bell x reddest bell, that where from pure bell lines.

 

[StinaKSU]

I understand what you are asking......what I'm saying is that its not the albino gene that's being modified. Linebreeding produces results because you increase the homozygosity of the animals....i.e. you are getting more genes to have 2 of the same alleles. Linebreeding doesn't make one gene change...so you are not making the albino gene more orange, you are making the animals more orange because of multiple genes....the albino trait would mean nothing in breeding in orange. breeding reddest bell to reddest bell will increase redness...but it has nothign to do with the bell trait itself.

The response of mine that you quoted was a response to:

Technically the traits I selectively breed for (tangerine) would be the trait of the bell albino, so if I breed a tangerine bell albino to a normal I would get 100% normals, that didn’t have a tangerine influence.

b/c you would get animals that WOULD have a tang influence. The traits you selected for would NOT be the trait of the bell albino gene........the traits you selected for would be traits of their own individual genes. You cannot change a single gene through breeding.

 

[Halley]

Line breeding doesn't make one gene change...so you are not making the albino gene more orange, you are making the animals more orange because of multiple genes....the albino trait would mean nothing in breeding in orange. Breeding reddest bell to reddest bell will increase redness...but it has nothing to do with the bell trait itself.

You cannot change a single gene through breeding.

Just had another similar question pop into my head, you say that line breeding will not affect a single gene (i.e. Bell) which makes complete sense. But… what about mack snows, some are line bred to be whiter, while other look almost like normals. So for instant if I took two white mack snows and breed them together, I would still get normals, and these normals would be very similar to ones I would get if I breed two yellow mack snows together. Meaning the normals from white mack x white mack would be no whiter than normals from yellow mack x yellow mack. So, doesn’t line breeding actually modify this gene to some extend?

Or with a patternless, take the GGG patternless for instant; my guess is that Marcia breeds them to have a better yellow color, and when I look at some other ones they are an almost dirt brown. This basically leads to the same thing. If I breed a really nice yellow patternless to a normal, I wouldn’t get offspring with more yellow, than if I breed a decent patternless to a normal. Didn’t line breeding modify this gene as well?

I might be totally off, but I think these are valid questions.

 

[Halley]

Bump!

 

[Sandra]

So for instant if I took two white mack snows and breed them together, I would still get normals, and these normals would be very similar to ones I would get if I breed two yellow mack snows together.

Or with a patternless, take the GGG patternless for instant; my guess is that Marcia breeds them to have a better yellow color, and when I look at some other ones they are an almost dirt brown. This basically leads to the same thing. If I breed a really nice yellow patternless to a normal, I wouldn’t get offspring with more yellow.

What makes you think this is true? Mack snows that are whiter due to selective breeding, or patternless that are yellower due to selective breeding, should indeed produce whiter/yellower offspring.