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Baby corns give me a surprise! Need help on genetics

Trust Jul 10, 2003 12:51 PM

So I have a pair of anerys - the female is a black morph (solid black blotches) and the male is more of a charcoal morph, both seem hypoxanthic (very little yellow). They are siblings.

I put them together expecting 100% anery, she laid eggs, and the eggs hatched (pipped?) this morning, and of the ~20, 5 of them appear to be snows. How can that be? Does that mean they are both het for snow?

Well, I also put the male with one of my amel females. If he's het for snow, does this mean 50% of these offspring will be blizzards? I was expecting only normal phenotypes from this clutch, but have always wanted a blizzard.

Replies (4)

Trust Jul 10, 2003 12:56 PM

Sorry!

Amanda E Jul 10, 2003 01:28 PM

I'm going to assume some things here.

First off, I'm assuming that the other 15 babies are all anery.
Second, that since the parents are siblings that they are either both anery or both charcoal.

Since you already have snow babies from the one clutch, I'm going to say that the parents are both anery and not some combo of anery plus charcoal, although, I guess that could be a slight possiblity.

The babies from the anery x amel mating, (as long as the amel ins't het for something) will be half normal and half amel. All of the normal babies being het snow and the amel babies being het anery.
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alstiver@hotmail.com

1.0 '01 Hypo snow cornsnake (Tesla)
0.1 '02 Ghost (pastel) cornsnake (Banshee)
1.1 '02 Bloodred cornsnakes (Desi and Luci Too)
1.0 WC Water snake (temporary pet - treating it for a cut on it's neck)
0.0.3 Goldfish (Kabuki, Isamu, and Yuki)
1.0 American Eskimo mutt (Rusty)

patricia sherman Jul 10, 2003 04:20 PM

"Snow" is a shorthand way means of defining an animal that exhibits both amelanism and Type-A anerythrism.

Your pair are evidently both het for amel, proven by the 1:4 ratio of snow offspring. The balance of the clutch statistically will be 1:4 homozygous anery, and 2:4 anery het amel. So, in terms of advertising those babies, you'd call them 66% het for amel (you can't call them het for snow, since they're already homozygous for the anery half of that combination).

As to the clutch from the anery het amel male bred to the amel female, the resulting offspring will be 1:2 amel het Type-A anery, and 1:2 phenotypically normal, and genotypically het amel & het Type-A anery (which you may advertise as 100% het snow).

It is my understanding that "blizzard" is an animal that exhibits a combination of amelanism and Type-B anerythrism. Your Type-A pair can't produce blizzards unless both the parents are het for Type-B anerythrism in addition to being het for amelanism.
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tricia

Trust Jul 10, 2003 08:40 PM

That's exactly the kind of information I was looking for!

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