Posted by:
rainbowsrus
at Fri Mar 2 14:52:44 2007 [ Email Message ] [ Show All Posts by rainbowsrus ]
Terms:
Gene = the basic unit of genetics, Genes come in pairs, one supplied from each parent. Each gene pair determines one specific trait. There are thousands of gene pairs in each strand of DNA.
Mutant gene = any gene that is different from the corresponding normal gene. Not necessarily a visual mutation.
Wild type or normal = A snake that looks like most of the snakes found in the wild. Also used to describe any individual gene that when paired up with a similar gene would produce a snake that, for that individual gene trait, would look like most of the snakes found in the wild.
Heterozygous (slang - heterozygous) = having two different genes within a gene pair. Most commonly one normal and one mutant but could be two different mutant genes.
Homozygous (slang - Homo) = having both genes within a gene pair the same. Can be normal or mutant.
Super = Slang term commonly used when a snake has a gene pair that is Homozygous for either a dominant or a codominant mutant gene.
Trait = Physical appearance that it distinguishable from the normal physical appearance.
Recessive mutant gene = Trait is only expressed when the gene pair is Homozygous for the specific mutant gene.
Dominant mutant gene = A mutant gene that has it trait expressed when the gene pair is either heterozygous or Homozygous for that specific mutant gene. Heterozygous and homozygous specimens are not 100% distinguishable from each other. Note, with some dominant traits some of the specimens can be visually identified as heterozygous or homozygous.
Codominant = Similar to dominant mutant gene except a Homozygous specimen can be distinguished from a heterozygous specimen 100% of the time.
Double heterozygous = Has two gene pairs where one gene in each pair is normal and the second gene is a mutant gene. I.e. double heterozygous for snow would have a normal gene paired with an albino gene and a normal gene paired with an anerythristic gene.
Triple heterozygous = same as double heterozygous except applies to three gene pairs.
Color mutations in boas:
Albino (AKA Amelanistic) - Two independent mutant genes: both recessive - a lack of melanin (black pigmentation) Kahl and Sharp strains.
Anerythristic - Two independent mutant genes; both recessive - a lack of red pigmentation. Two known strains (type I and type II)
Salmon (AKA Hypo) - Dominant - a reduction in the black pigmentation and often some increase in the yellow pigmentation.
Caramel Albino (AKA Tyrosinase positive albino) - believed to be at least two independent mutant genes; both recessive - has less than the normal amount of black pigmentation. Colombian and Nicaraguan strains
Caramel Hypo (Boawoman Hypo) - recessive - has leas than the normal amount of black pigmentation, similar to Colombian T-plus Albinos and Pastels.
Pastel (AKA Hypo) - Polygenic - A line of boas selectively bred for less than normal black pigment, not caused by a single mutant gene.
Blood - Recessive - A Hypererythristic mutation.
Named Color mutation combinations:
Ghost homozygous anerythristic / heterozygous hypomelanistic
Super Ghost - homozygous anerythristic / homozygous hypomelanistic
Snow homozygous anerythristic / homozygous albino
Sunglow homozygous albino / heterozygous hypomelanistic
Super Sunglow - homozygous albino / homozygous hypomelanistic
Bloody Salmon homozygous blood / heterozygous hypomelanistic
Moonglow homozygous anerythristic / homozygous albino / heterozygous hypomelanistic
Super Moonglow homozygous anerythristic / homozygous albino / homozygous hypomelanistic
Pewter - homozygous type II anerythristic / homozygous blood
Locale Related Color Mutations:
Sunset homozygous hypomelanistic having 50% Hog Island Boa blood
Salmontine heterozygous hypomelanistic having 50% Argentine Boa blood
Pattern Mutations:
Arabesque Dominant? - A genetic circle-back boa with a ladder-tail, Typically highly speckled and often having a very brown color with some specimens tinted pink.
Jungle Codominant - Originally identified in Sweden,
Motley Codominant
Stripe Recessive
Reverse Stripe Recessive?
Leopard Recessive - dark color, a mix of underlying tones and marbled pattern.
European Square tail - Recessive - long list of variable characteristics.
Scoria - Recessive? - Pink pattern-less with two parallel lines down back.
Aztec - Dominant?
Gray pattern-less - unknown
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Thanks,
Dave Colling
www.rainbows-r-us-reptiles.com
0.1 Wife (WC)
0.2 kids (CBB, a big part of our selective breeding program)
LOL, to many snakes to list, last count:
19.29 BRB
14.19 BCI
And those are only the breeders 
lots.lots.lots feeder mice and rats 
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Genetics 101, some terms etc. - rainbowsrus, Fri Mar 2 14:52:44 2007
