Why are some people bald?

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Offline thedoc

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Why are some people bald?
« on: 14/06/2012 10:30:02 »
Jon Kelling  asked the Naked Scientists:
   My son would like to know:

Why are some people bald?

He's 5, his name is Landon, and he would get a kick of hearing his
name on the air :)

Thanks!

Jon

P.S. love the show! Thank you!
What do you think?
« Last Edit: 14/06/2012 10:30:02 by _system »

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Offline evan_au

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Re: Why are some people bald?
« Reply #1 on: 21/06/2012 11:57:04 »
Hair loss can occur due to hair pulling, disease or medical treatment. Gradual hair loss occurs with age.

But the most common hair loss is male-pattern baldness, and is determined by genes which are triggered by male hormones. This constricts the hair follicle, so a normal, pigmented hair cannot grow.
The genes are active in a specific region of the scalp, leading to a distinctive pattern of hair loss.