I've always assumed that a Pastel's amount of yellow and brown was hereditary, i.e. a low brown / high yellow pastel would breed and create low brown / high yellow offspring but now I am questioning this. One of my very first BP morphs was a male Pastel that even as an adult was extremely high yellow with low brown coloring. When people saw him most asked if he was a Lemon Pastel which I told them that no, he was just an above average Pastel. I bred this high yellow Pastel to one of my normal girls and got 1.1 Pastels from the clutch. The male came out very bright yellow just like his dad and the female came darker yellowish/orange and now at 6 months she is already showing some brown on her back. To me this clutch seems to suggest that Pastel pigment is kind of like breeding Pieds, where a low white Pied can create high and low white Pied offspring.

What do you guys think? Is the amount of "Yellow vs Brown" in Pastels hereditary or random like the white in Pieds?

(and I'm talking about regular Pastels here, not NERD's Lemon Pastel which I believe is a separate proven genetic line)