I am trying to figure out the genetics of a spider albino, but I am not getting the results with a square. Could someone explain the normal gene to me? Is the normal gene dominant, co-dom, or recessive.

I was thinking it can't be dom or co dom because when it is breed to a dom or co dom the normal looking phenotype goes away, but when you breed recessives to a normal you still get hets and they still have the look of a normal. That has me a bit confused. Maybe someone can help and tell me where I am messing up.

S= Spider
N= Normal
a=Albino

Spider x Albino breeding

S N

a Sa Na

a Sa Na


So I get 50% spiders who are het for albino and normals who are het for albino. This is where I get lost.

Spider het albino x Albino

S a

a Sa aa

a Sa aa

So the result would be 50% Spiders het albino and 50% albinos. Still no Albino spider. I am sure my fault is in my punnet square, but I am not sure where. Thanks for the help!