Sex-linked coloration is a familiar phenomenon in the animal kingdom. Most people are familiar with the bright coloration of the male in many species of birds [2]. Instances of sex-linking of hair color in mammals are rare, but not unknown. For example, the tricolor pattern in the domestic house cat felix domesticus is found almost exclusively in the female [4]. We report here our discovery of sex-linking of hair coloration in a population of humans (homo sapiens). It is, to our knowledge, the first such reported observation in this species.
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