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Welll, I'm a total novice - not a gene expert by a long shot - but I'll venture that she'd have the dominate genes for blue egg shells from both sides. If the wheaton Ameraucana-ish mom and EE roo dad were from the same 'hatch,' I'd think maybe from the same flock but potentially different mothers (or perhaps fathers too, though maybe just one grandpa-roo). If the EE roo's mom had the genes for brown coating, then he could have contributed that as well, giving you the green egg layer. Did any of the other pullets fathered by him lay a brown coating on their eggs?
(Just trying to contribute, but platypuses (or is it
platypi?
) are definitely awesome!
)
None of the other EEs fathered by him are laying a deep green egg. Their eggs all look like my first generation EE girls (their moms) - varying shades of blue. This girl and her mom are the only ones with the single, flopped over comb as well. The others all have a pea comb as did daddy.
Very strange business, this egg colour thing. Science can now see the genes that are involved and make predictions but there seem to be so many variables that effect what makes them kick in.
Evolution is a marvellous thing. Those platypuses (platypi?) are certainly a perfect example of that. Perfectly adapted to suit their environment.