spider morph

NERD has it listed as Dominate so a Spider x Normal would produce spiders or a mix of normal and spiders?

spider x normal = 50/50 split... this is only odds no gaurentee its going to end up that way

so if spider is represented by S and normal is represented by N a Spider ball must be SN to get the 50 50 split as per the punnet square. correct?

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Originally Posted by Moriar

NERD has it listed as Dominate so a Spider x Normal would produce spiders or a mix of normal and spiders?

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Only if its a heterozygous spider. If it is homozygous, all it's offspring would have be spiders, just like a super pastel to normal would produce all pastel offspring.

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Originally Posted by ctrlfreq

If it is homozygous, all it's offspring would have be spiders,

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And good luck picking that one out...

Technically the only way to prove spider dominant would be if a homozygous one was proven by breeding to normals and producing a large number of only spiders and that proven homozygous animal was just like the more common heterozygous spiders except for breeding results. It has been widely assumed that spider is dominant because a different looking potential homozygous spider hasn’t been reported from spider X spider breedings but that doesn’t prove it dominant as there are other possible explanations.

So far I've not seen anyone come forward and claim to have a proven homozygous spider much less tell us what it's like.

Each egg from spider X spider should have a 25% chance of being a homozygous spider but if these eggs don't hatch or the homozygous spider babies don't grow up to breed it would be considered a homozygous lethal mutation which I think would be technically co-dominant because the homozygous is different than the heterozygous. There may be several homozygous lethal ball python mutations and the hets can still be very healthy and make very nice combinations with other morphs but eventually people will stop breeding the morph to its self trying to make homozygous versions.

Also, you may sometimes see "dominant" misused where "homozygous" should be used in the ball python community. For example, it's incorrect to refer to super pastel as the dominant form of pastel. The super pastel is the homozygous form of pastel. Because it looks different than the regular heterozygous pastel which is also a morph the mutation type is co-dominant. The mutation type refers to the mutation it's self and how it interacts with it's normal version and does not change from pastel to super pastel, only the genotype is changing - from heterozygous to homozygous.

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Originally Posted by RandyRemington

Technically the only way to prove spider dominant would be if a homozygous one was proven by breeding to normals and producing a large number of only spiders and that proven homozygous animal was just like the more common heterozygous spiders except for breeding results. It has been widely assumed that spider is dominant because a different looking potential homozygous spider hasn’t been reported from spider X spider breedings but that doesn’t prove it dominant as there are other possible explanations.

So far I've not seen anyone come forward and claim to have a proven homozygous spider much less tell us what it's like.

Each egg from spider X spider should have a 25% chance of being a homozygous spider but if these eggs don't hatch or the homozygous spider babies don't grow up to breed it would be considered a homozygous lethal mutation which I think would be technically co-dominant because the homozygous is different than the heterozygous. There may be several homozygous lethal ball python mutations and the hets can still be very healthy and make very nice combinations with other morphs but eventually people will stop breeding the morph to its self trying to make homozygous versions.

Also, you may sometimes see "dominant" misused where "homozygous" should be used in the ball python community. For example, it's incorrect to refer to super pastel as the dominant form of pastel. The super pastel is the homozygous form of pastel. Because it looks different than the regular heterozygous pastel which is also a morph the mutation type is co-dominant. The mutation type refers to the mutation it's self and how it interacts with it's normal version and does not change from pastel to super pastel, only the genotype is changing - from heterozygous to homozygous.

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EXACTLY WHAT I'VE BEEN FREAKIN SAYING!!! Thankyou for summing it up so nicely!!! Props

How many spider hatchlings would have to be produced out of how many clutchs to say a spider was a homozygous spider? 100% spider hatchlings out of how many clutches? At what stage do you say tentatively that it is, or might be?
Just wondering for personal reasons,
wolfy

A Homozygous spider would produce 100% spider hatchlings out of every breeding to a normal.

If you breed a Heterozygous spider to a normal, 50% should be normal, 50% spiders.

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Originally Posted by wolfy-hound

How many spider hatchlings would have to be produced out of how many clutchs to say a spider was a homozygous spider? 100% spider hatchlings out of how many clutches? At what stage do you say tentatively that it is, or might be?
Just wondering for personal reasons,
wolfy

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If I hatched out a single 100% spider clutch, I would start wondering, especially if it was a larger clutch, say 5 or more. If the next clutch was 100% spiders, I'd be thinking, "I may have a homozygous spider here!" 3rd clutch 100% - I'm thinking "I bet this guy/girl is homozygous!!!" 4th clutch - At this point I'm probably convinced. Would I tell people I'm absolutely sure? Nope. It can't be proven. An increasingly higher probability yes, but not proven.

Steve