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As I think about it you're wrong on what genotype and phenotype are. Genotype isn't possibility range. You have genes for havnig red hair but you are NOT a ginger because you have DOMINANT genes for blond hair. Your genotype didn't have a list of possibilities, it specifically stated you would be blonde. WHAT IS A POSSIBILITY is the gene you pass down to your offspring. Phenotype is the physical representation of someone's genotype, the GENOTYPE is what the person ACTUALLY IS.
I'm not a ginger because the blonde gene was expressed. If an individual with Klinefelters syndrome has all the phenotypical traits of a female, because the extra Y chromosome was not expressed, then they're female in exactly the same way I'm a blonde because the blonde gene was expressed.