It's a purely genetic argument, based on the relationship between genotype and phenotype: http://en.wikipedia.org/wiki/Genotype-phenotype_distinction http://en

It's a purely genetic argument, based on the relationship between genotype and phenotype: http://en.wikipedia.org/wiki/Genotype-phenotype_distinction http://en.wikipedia.org/wiki/Genotype-phenotype_distinction I might be stretching it a bit, but I think it's probably fine to assume that people with innate abilities will express them in multiple similar ways.