I my personal experience, normals do contribute to the genes just like a morph does. For example, I have a very light colored female whom I used to breed extremely light vanillas. I also have a high blushed female who produced my exceptional fires.

My husband has a very reduced pattern normal who made some very reduced spiders and a reduced lesser.

If this female is very dark with minimal blushing, then I do not advise breeding her with high blushing light morphs as you will defeat your purpose. A female like her can be invaluable for darker morphs such as Black Pastel, Mocha, Chocolate, Red Axanthic, and perhaps Cinnamon.

Gale