I ain't no geneticist, so I'm probably starting off on a faulty hypothesis, which is that all the seeds from one plant will be identical. Heck, I don't even know if seeds from the same fruit are identical. Anyway, if identical twins have different nuances, although their DNA is identical, perhaps a tomato variety will have different nuances in its seeds from year to year even if the DNA is identical. Not enough difference to not be the same variety, but different enough for someone like you to notice.
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