I have a question about Spider BPs

[M&J in NC]

I've been reading everything I can find out about morphs, mainly spiders. Some websites say that spiders are dominant, while others say they are co-dominant. I'm new to the morph-scene, but it's my understanding that if you breed a normal BP to a co-dominant (spider) the clutch will be 50% morph (spider) and 50% normal on average.

Have any of you ever gotten spiders from a spider/normal cross?

Thanks, Michael

[Slim]

http://www.ball-pythons.net/forums/s...ad.php?t=52847

[gixxerrobballs]

this should help....
http://ballpython.ca/genetics.html

[M&J in NC]

Thanks guys. Those were two sites I had not seen. I think my first morph is going to be a spider. Any idea who much a young spider female would cost at a reptile expo?

[muddoc]

Have any of you ever gotten spiders from a spider/normal cross?

Thanks, Michael

I do every year.

Spiders are definitely a dominant mutation. Dominant meaning that the Heterozygous form and Homozygous form are the same, but visually different from wild-type. Most people believe that the homozygous form is lethal, but I have heard of at least one Spider that is a possible Homozygous, and has produced nothing but Spiders. So either way, the homozygous form has not proved to be different from the heterozygous form (which would be co-dominant or incomplete dominant).

Hope that wasn't too confusing, and answered your question.

[JAMills]

I do every year.

Spiders are definitely a dominant mutation. Dominant meaning that the Heterozygous form and Homozygous form are the same, but visually different from wild-type. Most people believe that the homozygous form is lethal, but I have heard of at least one Spider that is a possible Homozygous, and has produced nothing but Spiders. So either way, the homozygous form has not proved to be different from the heterozygous form (which would be co-dominant or incomplete dominant).

Hope that wasn't too confusing, and answered your question.

Really that would be great, I had not heard of a possible Homozygous spider yet. I have heard of the possible Homozygous Pinstripe.... BHB has one I believe.


As for the Price on a Female spider at a show that would depend on age/quality/vendor.
I would say expect to pay a minimum of $250 for a hatchling female

[southb]

They are dominant because there is no super form of the morph. Just like pins are.

[muddoc]

They are dominant because there is no super form of the morph. Just like pins are.

That is not what makes them dominant.

[Bluebead]

That is not what makes them dominant.

We call them dominant because even if they have a homogenous form, which as far as I know hasn't been proven to everyones satisfaction, its not visual.
IE the heterogenous and homogenous forms are exactly the same visually.
Spiders and Pins are both still under discussion for this.


Codominant is where super forms come into play.
IE cinnamon is the heterogenous form while black ball is the homogenous form.
This happens with all of the 'pastels', yellow bellies, fires etc.
(I'm thinking in cinnamon right now b/c my virgin male had his first lock tonight for valentines

Marks genetics 101 page (http://www.ballpython.ca/genetics_101.html) tells you alot more about the details

Correct me if I'm wrong .... its 4am for me.

[muddoc]

Codominant is where super forms come into play.
IE cinnamon is the heterogenous form while black ball is the homogenous form.
This happens with all of the 'pastels', yellow bellies, fires etc.
(I'm thinking in cinnamon right now b/c my virgin male had his first lock tonight for valentines

I am not correcting you, because that was a good description. However, the use of the word super is only used when talking about snake genetics. It is not actually a genetic term, and I think it is why people get confused about how genetics work.

Co-dominant (or incomplete dominant) is actually defined as an inheritable trait in which the heterozygous form looks different than normal and the Homozygous form is different than the heterozygous form. As I said, you are not wrong, I just want people to understand that a super is really a homozygous animal.