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Though yours is a regular one.

I think female-female divides are rare, but also probably can happen, from what I've heard.

You can't realy genetically engineer that. Also, the reason it is being studied has to do with comparing how each one of these chicken's cells has its own sex, regardless of chromosomes, because it might reveal more about what chromosomes do.

They do come in all shapes and sizes, that sounds like a gynandromorph to me.