Posted by:
Paul Hollander
at Fri Oct 15 19:21:18 2004 [ Email Message ] [ Show All Posts by Paul Hollander ]
>Now hes combineing things and not calling them the right thing. Example would be a Homozygous Amelanistic Anery A, He thinks thats the right answer and i keep telling him that its what is called a snow and he has no idea what im talking about. So i had to explain to refresh his memory from earlier this week and tell him that an Amelanistic Anery A (snow)is Co-Dominant. Or it shows both traits.
Actually, amelanistic anerythristic is valid, especially if he is talking about the genes. Snow is just more commonly used in the hobby. That does not make amelanistic anerythristic incorrect. And using amelanistic anerythristic rather than snow is more understandable to beginning students (IMHO) when they are working a two locus Punnett Square. "Snow" is just shorter and sexier than "amelanistic anerythristic".
"... Amelanistic Anery A (snow)is Co-Dominant." This is 100% wrong. Amelanistic is recessive to it's normal allele. Anerythristic is recessive to its normal allele. The amelanistic mutant gene and the anerythristic mutant gene are independent mutants found at different loci. Amelanistic anerythristic (snow) is the phenotype produced by combining the phenotypes produced by two recessive mutants at different loci.
Codominant refers to one locus, not two. There are three possible phenotypes from different combinations of two alleles. The normal phenotype, when there is a pair of normal alleles. The full mutant phenotype, when there is a pair of mutant alleles. And the heterozygous phenotype, when a mutant allele is paired with a normal allele. Example -- the normal reticulated python, the homozygous (super) tiger reticulated python, and the tiger reticulated python. BTW, I am using "codominant" as a synonym for "incomplete dominant", "partial dominant", and a dozen other terms.
And if you use "super" instead of "homozygous", your teacher should cut you off at the hip. He's trying to teach standard genetics, and "super" is herper genetics slang that ought to be expunged from the language.
I worked at a university genetics lab for five years. I can assure you that relying on the genetics you see on herper forums and websites is a quick way to shoot yourself in the foot. In some cases, it's more like shooting yourself in the head.
Paul Hollander
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Your teacher is not as far off base as you think. - Paul Hollander, Fri Oct 15 19:21:18 2004