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I do believe that EE is dominate and you will have 100 % EE of various colors. Many will make blue/green eggs but maybe not all. The theory is once you have mixed breeds of which an EE is one of those mixed or also called mutt, all offsprings will be EEs of some sort or another. If you have a mix of silkie and polish, all offspring will be a mix of silkies and polish. So it goes, if you want a pure bred flock all of the same pure breed must be used in the flock for breeding. Since EE is not a breed but a mix that lays blue/green eggs is will always be a mix or mutt.