The genetic basis of<unk>  has not been settled. Some researchers have proposed a Y-linked pattern of inheritance and others have suggested an autosomal gene is responsible. A third hypothesis predicts the phenotype results from the interaction of two loci, one on the homologous part of the X and Y and one on the nonhomologous sequence of the Y. These hypotheses are not mutually exclusive, and there may be a variety of genetic mechanisms underlying this phenotype. Lee et al. (2004), using Y-chromosomal DNA binary-marker haplotyping, suggested that a cohort of southern Indian hairy-eared males carried Y chromosomes from many haplogroup. The hypothesis of Y- linkage would require multiple independent mutations within a single population. No significant difference between the Y-haplogroup frequencies of hairy-eared males and those of a geographically matched control sample of unaffected males was established. The study concluded that<unk>  is not Y-linked in southern India, though this result may not apply to all to all populations.
Auricular hypertrichosis
Hypertrichosis
Generalized lentiginosis
Hypertrichosis cubiti
Centrofacial lentiginosis
Amastia
Woolly hair nevus
Hot comb alopecia