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Do I want to learn about genetics? Yes. Is it very intimidating and scary? Yes.

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Real ameraucanas SHOULD have OO, because if you breed Oo to Oo you can get brown/white egg layers (oo). But it sometimes depends on who you get them from, even breeders can be unreliable about it on occasion. :T :T :T I know from experience.
That's what I figured, just thought I'd double check!
 
Would this be a blue wheaten Ameraucana?
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If by "second gen" you mean an F1 (baby of a cross between blue and brown egg layer), specifically it'd have the extra dark brown egg genes of a marans for example but yes. Otherwise it'd just lay green.

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But for a second gen would it have double of the really dark egg genes? then O/o for the blue, to make the second gen egg?
 
But for a second gen would it have double of the really dark egg genes? then O/o for the blue?

Well, all things in proportion, O/o + DKBRWN/brown can only pass down one of each. So an F1 olive egger breeding back to a marans would give half the chicks o/o, and half O/o, and the same with dark brown split to brown. Because your parents will look like;

(Using B to represent dark brown, and b regular brown, though it's more complicated than that)
Marans; "o/o B/B"
FI olive egger "O/o B/b"

Since the marans MUST hand down "o" and "B" (they don't have any other genes TO hand down) the egg color of the offspring is determined exclusively by which gene the olive egger hands down, which is random. You could get chicks that are; O/o B/B, o/o B/B or O/o B/b. Which mean the cross will produce, at random, 50% dark browns and 50% blues, with it being totally random if they end up on the same bird.
 

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