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Heterozygous

Lucille

Lucille

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I am trying to understand, gradually, how some of the more complicated genetics work in reptile breeding.
I saw an appelation 'possibly het' on some snakes for sale recently.
So far, I understand homozygous (shows the trait) and heterozygous (carries the trait but does not exhibit it).
How does a possible het work, is it out of breedings that look normal but carry traits or what?
 
Well, I don't raise boas, but I do understand the homozygous/heterozygous/possible het game. (or, at least I think I do. lol)

Here's a chart I made a while ago for a leo breeding.

aaBbPp.jpg


Basically, when you breed two hets together, you'll wind up with a certain percentage of "normal looking" offspring. Each of those offspring have a certain possibility of being het, but there's no way to tell which ones carry the recessive gene without breeding them to prove them out.

Let's say you breed an albino (recessive) to a normal non-het. All of the offspring would appear normal, but would be heterozygous for the albino gene. If you were to breed two of the offspring to each other, 1/4 would show the albino gene (homozygous for albino) and the other 3/4 would appear normal. Of those 3/4 that appear normal, [theoretically] 2/3 of them would be heterozygous for albino. Since you can't tell by looking at them which of the normals carry the albino trait, you assume that each one has a 66% chance of being heterozygous for albino--therefore you get "66% possible hets".

I hope that makes sense. :slamit:
 
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