Random morph question

Spider x spider is not considered lethal. Sorry.
Spider is a dominant, there can be no super. Only a co-dom can create a super form.

Quote:

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Originally Posted by CollideOverMe

Spider x spider is not considered lethal. Sorry.
Spider is a dominant, there can be no super. Only a co-dom can create a super form.

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Super is really tricky when herpers use it. It could mean an animal with an extreme appearance caused by two copies of a particular codominant mutant gene in a gene pair. Or it could mean an animal with two copies of a dominant mutant gene. The first is more common simply because dominant mutant genes are rare in snakes.

S = a spider mutant gene
+ = a normal gene
// = an homologous pair of chromosomes
S//+ = a gene pair made up of a spider mutant gene in one chromosome and a normal gene in the same location in the other chromosome.

A spider ball python has a S//+ gene pair.

S//+ x S//+ -->
1/4 S//S (homozygous spider, AKA super spider). Dead????
2/4 S//+ (spider appearance). Alive
1/4 +//+ (normal). Alive.

No one has reported a S//S ball python from a breeding test, so we do not know what an S//S ball python looks like. It may or may not look like a S//+ ball python. We know a S//+ ball python does not look normal. Until someone produces a S//S ball python, all we are sure of is that the spider mutant gene is not recessive to the normal gene. The spider mutant gene could be either dominant or codominant to the normal gene; nobody knows. When speaking about the spider mutant gene, dominant means "not recessive".

Quote:

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Originally Posted by paulh

Super is really tricky when herpers use it. It could mean an animal with an extreme appearance caused by two copies of a particular codominant mutant gene in a gene pair. Or it could mean an animal with two copies of a dominant mutant gene. The first is more common simply because dominant mutant genes are rare in snakes.

S = a spider mutant gene
+ = a normal gene
// = an homologous pair of chromosomes
S//+ = a gene pair made up of a spider mutant gene in one chromosome and a normal gene in the same location in the other chromosome.

A spider ball python has a S//+ gene pair.

S//+ x S//+ -->
1/4 S//S (homozygous spider, AKA super spider). Dead????
2/4 S//+ (spider appearance). Alive
1/4 +//+ (normal). Alive.

No one has reported a S//S ball python from a breeding test, so we do not know what an S//S ball python looks like. It may or may not look like a S//+ ball python. We know a S//+ ball python does not look normal. Until someone produces a S//S ball python, all we are sure of is that the spider mutant gene is not recessive to the normal gene. The spider mutant gene could be either dominant or codominant to the normal gene; nobody knows. When speaking about the spider mutant gene, dominant means "not recessive".

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Yea what he said...


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Like most of our "dominant" morph, spiders do not have a proven homozygous form, whether it is from it being lethal or just simply from a lack of trying, there is almost no hard evidence of anything and definitely nothing conclusive.

OP you may find this helpful http://www.owalreptiles.com/issues.php

awesome thanks!!

After the thread where that Tommy Rosati kid from Spokane posted all the misinformation claiming breeding results from thousands of spiders you can see how the ball python community is screwed up enough not to know if spider is co-dominant lethal or dominant just unproven 20+ years after the original spider.