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Info, Links, Hints, Tricks to Cornsnake Genetics:

H

h0mersimps0n

New member
Hello Rich and everyone. I was wondering if we could get a "sticky" for this forum and get people to contribute links, articles and reference stuff so newcomers can "brush up" before entering the fray. I too would love to read and be educated more before asking dumb questions and also avoid not asking the good questions...

Here are some of the sites I found around:

http://serpwidgets.com/Genetics/genetics.html

http://www.cornsnakemorphs.com/genetics.html

http://www.reptimania.co.uk/cornmorphs.htm

http://www.pitt.edu/~mcs2/herp/genetics.html

I haven't had a chance to read through them all, but I definitely will...

Please feel free to add whatever good articles or information you've posted in the past that you thought was really helpful for you...

thanks!
 
I don't hate anybody enough to direct them to the reptimania site. And the pitt.edu site is pretty poor.

There is a <a href="http://www.genome.iastate.edu/edu/genetics/main.html"> Blue Genes</a> web page that is better than most I've seen, though it could be improved considerably.
 
For anyone who is researching through reading from the following links, I thought I'd include a couple of notes for what I think are misprints/errors on these pages: (Don't get me wrong, they're still good reading. :))

h0mersimps0n said:
http://www.cornsnakemorphs.com/genetics.html
Click to expand...
Anerythristic Type "B" • This morph lacks erythrophores, the red pigment in the skin. This type tends to posess a large amount of yellow pigmentation in the neck. It is NOT compatible with Type "A" Anerythrism. AKA : Charcoal

(This was probably a copy/paste error from anery A. They generally (but not always) have less yellow than Anerys. Personally I prefer to call them Charcoals to avoid all confusion with type A, but that's my own preference. :))

Blizzard • This morph is the product of combining the Amelanistic and Anerythristic Type "B" genes. This morph is SOLID WHITE with NO pattern.

(Some are at hatching, but a lot of them show visible pattern and some have yellow outlines around the saddles.)



http://www.reptimania.co.uk/cornmorphs.htm
Charcoal or Anerythristic Type B ( Pine Island )
This Anerythristic gene gives the snake a bluish tinge around the head and eye area, they are paler than the Type A and have no yellow pigment around the throat and neck area. Breeding a Type A to a Type B will give you Anerythristic and Normal looking babies in a clutch, concluding that the Type B Anerythristic is also carrying the Type A gene. These snakes come from Pine Island off the coast of Lee County Florida. First discovered in 1984 through selective breeding by Bill & Kathy Love.

(Again, many have yellow pigment. All of our charcoals have yellow. Also, the second segment was true of the first charcoal specimen, it was het for anery. However, any given charcoal can be not het for anery, in which case it would produce all normal offspring when crossed to an anery.)

Blizzard
A combination of the Anerythristic Type B gene & the Amelanistic gene produces a snake that as an adult is completely white and patternless...

(See the above about blizzards...)

Hurricane
A combination of the striped gene & the motley gene where the blotches are joined by striping giving a pattern that consists of a series of circles that run down the back of the snake, not all combinations of the stripe/motley gene give this pattern, some look intermediate between the two, others have well defined square blotches this morph has been coined the "Cubed" corn.

(This seems to be a description of motley/stripe corns, not hurricane motleys.)



http://www.pitt.edu/~mcs2/herp/genetics.html

(This is a good primer. The information is presented pretty well and it's useful.:) )



The other link I'd add to this list is my own morph library. ;)
http://serpwidgets.com/Morphs/morphs.html
 
paulh said:
I don't hate anybody enough to direct them to the reptimania site.
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LMAO, don't hold back Paul. ;)

And the pitt.edu site is pretty poor.
Click to expand...
It's basic, but accurate. I would do a few things different: he typoed "geneotype" several times, and used "gene" where "locus" would be more clear, but overall it doesn't give bad information or anything. It's just rather simplified, but that gets people rolling on the general idea, so IMO it's helpful as a part of the learning process. :)
 
I can only work so fast here!!!

Hopefully within a week or so I'll have the basic outline for the stickies on each forum where it's needed.

Obviously with this one I'll get some help and links from Serp just for a very basic primer into genetics.
 
h0mersimps0n said:
Hello Rich and everyone. I was wondering if we could get a "sticky" for this forum and get people to contribute links, articles and reference stuff so newcomers can "brush up" before entering the fray. I too would love to read and be educated more before asking dumb questions and also avoid not asking the good questions...

Here are some of the sites I found around:

http://serpwidgets.com/Genetics/genetics.html

http://www.cornsnakemorphs.com/genetics.html

http://www.reptimania.co.uk/cornmorphs.htm

http://www.pitt.edu/~mcs2/herp/genetics.html

I haven't had a chance to read through them all, but I definitely will...

Please feel free to add whatever good articles or information you've posted in the past that you thought was really helpful for you...

thanks!
Click to expand...

I have started making my own site (I have a link in my signiture). Though I don't give a break-down on the genetics portion, I do have descriptions of the genes, what the gene generally does, and the selective-bred varients that have been done with the genes. All I have to do now is go through some basic revisions and get some descriptions of the morphs using multiple genes. I should have all this done by Wed (that is my last day of high-speed for a while). If something is confusing or if you notice anything that I need to add/change, please e-mail me and I will be more than happy to get it done.
 
Here is why I consider the pitt.edu site poor.

It is nowhere near as good as the serpwidgets site.

It's totally off base with the last paragraph of the Basic Genetics section, "Now this fictional example is actually very close to what occurs in corn snakes except that there are primarily two genes involved, one that encodes the black color seen on the ventral surface and around the edges of the saddles and another gene which encodes the red color of the saddles and ground pattern."

And in my opinion nobody can jump straight to a two-locus Punnett Square without understanding a one-locus Punnett Square, which is not covered.
 
paulh said:
Here is why I consider the pitt.edu site poor.

It is nowhere near as good as the serpwidgets site.
Click to expand...
Well who can argue with that? ;)

It's totally off base with the last paragraph of the Basic Genetics section, "Now this fictional example is actually very close to what occurs in corn snakes except that there are primarily two genes involved, one that encodes the black color seen on the ventral surface and around the edges of the saddles and another gene which encodes the red color of the saddles and ground pattern."
Click to expand...
Yeah, there are a LOT more genes than one that go into making each pigment. I don't think this is important for someone who is just learning the basics, and it helps to keep the first examples as simple as possible. Kinda like when you're learning subtraction and they first tell you "you can't subtract 5 from 3." (That always annoyed me because I learned number lines on a thermometer and I knew about negative numbers by then, LOL.)

And in my opinion nobody can jump straight to a two-locus Punnett Square without understanding a one-locus Punnett Square, which is not covered.
Click to expand...
Good point, I missed that. I guess I'm not used to worrying about one-locus Punnetts so I didn't miss it when it was skipped. ;) Gotta give them kudos for using gametes, that almost always gets skipped.

It's definitely not "read this page and you've got everything you need to know" but it's helpful to see the material presented from different angles because usually it's one certain angle that suddenly makes it click into place. :)
 
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