Is the amount of brown pigment in Pastels really hereditary?

[Adam Chandler]

You need to remember that BOTH parents add to the genes of the offspring.

So what you are saying is the normal mom passed genetics that caused baby male Pastel to be brighter and his sister to have more brown?
Wouldn't that mean if I bred the high brown Pastel female to a normal it could produce high yellow / low brown babies based on what that normal dad passes?