Standard
Hair thickness
EDAR · rs3827760
What each result means
A/A
Typical EDAR activity in published research — associated with the ancestral hair-thickness profile.
A/G
One copy of each allele. Published research associates this genotype with an intermediate effect on hair shaft thickness.
G/G
Published research associates this genotype with thicker hair shafts, more scalp sweat glands, and a distinctive tooth-shape trait (shovel-shaped incisors) — one variant affecting several traits at once. Common in East Asian and Indigenous American populations, and one of the most well-documented examples of recent positive selection in the human genome.
Source: Fujimoto et al. 2008, Human Molecular Genetics — a scan for genetic determinants of human hair morphology identifies EDAR.
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