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BTW, here's the link to the article: http://marans.org/eggreview.pdf
Okay, I found an awesome article about egg color genes, but......it's complicated!! Here's is the best I can condense it for my case.
There are only two egg colors: white (o+) or blue (O). A separate allele determines if the egg will be brown + there are inhibitors that can mask any brown egg allele, as well as modifiers to determine the shade of brown.
My pure Ameraucana should carry O/O (two blue egg genes with no brown egg inhibitor--otherwise you'd still only get blue eggs) and my Marans should carry o+/o+ (technically a white egg) and are homozygous for dominant brown egg allele + brown egg modifiers (which is what makes them especially dark). The resulting OE should be O/o+ (making it a blue egg) and heterozygous for dominant brown egg alleles + brown egg modifiers, which results in olive eggs.
Now, my OE crossed to my Leghorns gets a little more complicated because basically it would produce 50% O/o+ (blue) & 50% o+/o+ (technically white), but you have to factor in the chance of the dominant brown egg alleles and any brown egg modifiers passing from the heterozygous OE, giving you this:
1) O/o+ would also have a 50% chance of getting the dominant brown egg allele which would make the eggs green and the shade of green would also depend on the 50% chance of getting the brown egg modifier to make it darker.
2) o+/o+ would have the same 50% chance to produce brown eggs and again the 50% chance of getting the brown egg modifier to determine the shade of brown
So, this is how I got one OE/Leghorn hen laying a very light brown egg (she must be an o+/o+ with brown egg allele & not brown egg modifer) and one OE/Leghorn hen laying a light olive green egg (she must be an O/o+ with a brown egg allele & most likely the brown egg modifier). Wow! Now I just know you all understand that perfectly, right?
If there's someone that is better at the genetics than someone who just read a couple articles tonight (me), I would love to hear from you...Does this all sound right??
BTW, here's the link to the article: http://marans.org/eggreview.pdf