PigmentationColorPolymorphism, GeneticSelection, GeneticBiological EvolutionPolymorphism, Single NucleotidePhenotypeColor PerceptionColor VisionGenetic Predisposition to DiseaseGene FrequencyColor Perception TestsAllelesUltrasonography, Doppler, ColorHair ColorColor Vision DefectsHaplotypesCase-Control StudiesGenotypeEye ColorPolymerase Chain ReactionPolymorphism, Single-Stranded ConformationalGenetic Association StudiesLinkage DisequilibriumGenetic VariationAsian Continental Ancestry GroupSequence Analysis, DNABase SequenceGenetic MarkersMolecular Sequence DataHomozygoteRisk FactorsEchocardiography, Doppler, ColorEuropean Continental Ancestry GroupAmplified Fragment Length Polymorphism AnalysisMethylenetetrahydrofolate Reductase (NADPH2)ChinaHeterozygotePromoter Regions, GeneticSkin PigmentationChromosome MappingProsthesis ColoringColorimetryMutationExonsMicrosatellite RepeatsDNA PrimersGenetic LinkageOdds Ratio