With the tiger gene in retics, it's a pattern mutation. The "super" form is immediately distinguishable from the tiger visually. It's what is commonly referred to as a co-dom gene. A tiger is merely a heterozygous super tiger. The het form is visually different from the wild type.
Spider is a dominant gene. The herterozygous form is visually no different than the homozygous form. The spider gene is dominant over the wild type gene. Whenever it is present, even in the herterozygous state, it is expressed.
A spider ball with only one spider gene will produce both spiders and normal appearing offspring depending on whether the spider gene was passed on or not.
In the homozygous or "super" state, the snake is visually no different, btu since it has two spider genes, it cannot produce normals.
From what I have gathered, it is not overtly obvious when a salmon is homozygous, a super salmon. You said:
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The only way to tell if a boa is a super is to prove it out. All of the resulting young will be hypos.
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With a tiger retic, you just look at it to determine if it's a super. They look completely different from a tiger. A spider ball though is as you described the salmon. The only way to tell if it is a super (meaning homozygous) is to prove it out and it will produce nothing but spiders.