Why a strand of hair bends or falls the way it does may sound like a
simple question, but the answer is rather convoluted. On one level, the
texture of a person's hair derives from his or her genes. A 2009 study
looked at the genetics of waves and curls and reported a heritability of
between 85 and 95 percent.
How does this play out at the level of a single hair? Research shows
that the curvature of a strand depends on the nature of its follicle.
When a follicle is asymmetrical, the hair that it produces is oval in
shape and
tends to curl. When it's symmetrical, the strand that emerges grows round and straight.
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