I suspect the Entwives are still about, somewhere. There must be at least one Entwife about. On wheather they had X and Y chromosomes, this I doubt, I agree with claudea99 that it the sex determination of an Ent was just as it would be in any plant that has diffrent male and female plants. The real question is whether trees that were both male and female could become ditinct sexes when they were "awakened" or whatever by the Elves.
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