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1.Because they simply didn't.
2.Its fully possible. I will do a quick example. This polish man on the left will who I randomly found will be more WHG and less Neolithic admixed than me and I still end up having a more CM appearance thanks to the right gene expression.
I don't really know what kind of WHG I will have since I never bothered to do those kind tests but in any case it will not be higher than an average Pole.
So In the end correct gene expression trumps all, various admixtures can definitely stay silent on your phenotype regardless of percentage.
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