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There are a few feather-color genes that are linked to some of the comb genes, but I don't think any of them would have caused what you're seeing. I'm seeing blue (grey) and black, and the gene that causes blue is not considered to be linked to the pea comb gene (or any other known comb gene.)...

For the two pictures you posted first: yes, the light one has the heterozygous pea comb, and the dark one look single (straight) to me. At least for me, it's easier to tell in pictures by looking straight at them (like the lighter one) so I can see whether there are extra lumps on each side...

It could be either way. I think 2 copies of the blue egg gene is more likely, but is not certain. Of course you could test by breeding to a not-blue-egg rooster, raise some daughters, and see if any of them lay not-blue eggs. If you find any daughters laying not-blue, then the mother is...

With an EE mother and Cream Legbar father, that should be a modified PEA comb, not rose. Pea comb is the one with a genetic link to blue egg color (or lack of blue egg color, in some breeds.) Rose comb has no genetic link with blue egg color. I think you're talking about the gene that blocks...

I think they are supposed to breed true for egg color, but it's just described as green, not olive. "Olive" usually refers to the darker shades of green chicken eggs, not all green eggs.

When I've had chicks with P/P pea combs and p+/p+ single combs, I could see the difference from a very early age: the single combs looked very skinny next to the pea combs. I haven't dealt with crosses between the two, so I don't have experience with the P/p+ appearance in chicks. You could...

Would the sterilizing mess up the DNA, so the test would then be worthless? Or is it just one more hoop to jump through in order to get the test done?

Wow, that got long before I noticed! I think I've read it all now, and most of what I would say has been said by someone else, but here are a few points: Wrong. Brown or not-brown, and what shade of brown, is controlled by quite a few genes. (If you pretend that each gene can make the brown...