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Question on triple hets...

tcdrover Aug 14, 2007 09:37 AM

OK, if I breed a Ghost male to a hypo het for albino female I
would get some neonates that are het for moonglow right?

Some would be het for snow & moonglow I think(?).

I'm not sure, how this works exactly. The hets for albino would
also be het for snow & Moonglow, or could those traits be
passed seperately to different neonates?

I'd also like to know what the ratio would be if I was able to
somehow identify which ones are het for albino in that litter
and breed them to each other. Thanks..........tc

Replies (2)

Paul Hollander Aug 14, 2007 01:01 PM

>OK, if I breed a Ghost male to a hypo het for albino female I
would get some neonates that are het for moonglow right?

When I took genetics, the instructor impressed on us that figuring out a cross required identifying the actual genes in the gene pairs under consideration.

A ghost would have a salmon//normal gene pair, an anerythristic//anerythristic gene pair, and a normal//normal gene pair (where the female is het for albino). We ignore all the other genes.

The hypo het for albino female has a salmon//normal gene pair, a normal//normal gene pair (where the male has the anerythristic mutant genes), and a normal//albino gene pair. We ignore all the other genes.

Result:
(1/4 salmon//salmon, 2/4 salmon//normal, 1/4 normal//normal)
(all normal//anerythristic)
(1/2 normal//albino, 1/2 normal//normal)

The salmon//salmon are hard to tell from the salmon//normals, so call it 1/4 normals and 3/4 salmons (33% probability homozygous salmon).

Putting it all together:
3/8 salmon heterozygous anerythristic heterozygous albino (looks salmon)
3/8 salmon heterozygous anerythristic (looks salmon)
1/8 heterozygous anerythristic heterozygous albino (looks normal)
1/8 heterozygous anerythristic (looks normal)

If you could pick out the snakes that are het albino in this bunch and breed them together, 1/4 of the babies would be albino. But all the het albinos are also heterozygous anerythristic, so two normal-looking but heterozygous albino babies would actually produce 9/16 normal-looking babies, 3/16 anerythristic, 3/16 albino, 1/16 albino anerythristic (snow).

Try www.geneticswizard.com for the results of breeding other pairs of these babies. I'm out of time and must log out.

Paul Hollander

tcdrover Aug 17, 2007 12:50 PM

complicated than I anticipated.

Seems like too much of a gamble and the payoff will take too
long. I think I'm better off breeding my ghost to my Harlequin
female & my albino to my hypo-het for sunglow, the much more
obvious pairings.

You da man Paul!

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