Hi,
Yes - you need to understand the differences between what we call recessive, co-dom and dominant morphs.
A recessive looks normal as a heterozygous but visualy different as a homozygous.
A codom looks different (from a normal) as a heterozygous and different again ( from both normal and the het ) as a homozygous.
A dominant morph looks different (from a normal ) as a het but then looks the same as a het when it is homozygous.
Pastel and yellowbelly are the het forms of their respective mutations - the homozygous forms (which are the ones that cannot produce normals ) being superpastel and ivory.
It tales a little getting used to but once it gets sorted out into which morph is in which group things get a lot easier to predict.
Think of the genes as being in pairs if it helps.
Pastel = one pastel gene and one normal gene.
Superpastel = two pastel genes.
Yellowbelly = one yellowbelly and one normal gene.
Ivory = two yellowbelly genes.
dr del