Reptile & Amphibian Forums

what does this mean? does this mean that both parents were het but the baby came out as a normal? just trying to figure genetics out and im not the best at it?

Both parents were homozygous for different traits, such as albino and anery. It takes two genes of each trait to be homozygous/visual; so, the babies will look normal but carry one of the genes for each trait, het albino and het anery, aka double het. snow.

Mark
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uncommonboa.com

Also can apply to dominant traits and if so does not have to be homozygous for the dominant trait. For example a Sunglow bred to a het Albino would produce.....

Sunglows
Albinos
Visual Hypo's that are also het Albino (DH Sunglow)
Visual normals that are het Albino.

And to split one little hair....

"Both parents were homozygous for different traits"

is not 100% correct. In the Snow example you can get some DH Snow's from breeding a Snow to any animal that is not visually Albino or Anery. (Normal, Het Albino, Het Anery or even a DH Snow)

In its most simple form, Double Het DH means the animal is het for two different traits, sometimes recessive, sometimes not, and sometimes that combination of traits has another name like Snow = Anery and Albino or Sunglow = Hypo and Albino
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Thanks,

Dave Colling

www.rainbows-r-us-reptiles.com

0.1 Wife (WC and still very fiesty)
0.2 kids (CBB, a big part of our selective breeding program)

LOL, to many snakes to list, last count (05/26/2009):
36.51 BRB
29.42 BCI
And those are only the breeders

lots.lots.lots feeder mice and rats

>In its most simple form, Double Het DH means the animal is het for two different traits, sometimes recessive, sometimes not, and sometimes that combination of traits has another name like Snow = Anery and Albino or Sunglow = Hypo and Albino

Traits refer to appearance, but het (short for heterozygous) refers to the genes in a gene pair. Add in the fact that some names refer to the effects of combinations of gene pairs. So it is really better to use gene pairs rather than traits in the explanation.

All gene pairs are homozygous or heterozygous.

If the two genes in the gene pair are the same, then the gene pair is homozygous. Examples: two normal genes, two identical dominant mutant genes, two identical recessive mutant genes.

If the two genes in the gene pair are not the same, then the gene pair is heterozygous. Examples: a normal gene and a dominant mutant gene, a normal gene and a recessive mutant gene, two different mutant genes.

A double het creature has two gene pairs that are heterozygous. A triple het has three gene pairs that are heterozygous. And so on.

Paul Hollander