Questions tagged [hair]

Hair is a biopolymer mostly made from keratin, which grows from the skin. Hair is exclusively found in mammals.

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Were Neandertals as Hairy as We Are?

What I mean to say regards facial and androgenic hairs. There are many theories as to why some people have both kinds of hairs, while others have one or the same and others still have neither. The ...
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Number of hair cycles in humans

I've seen several websites claim the amount of hair cycles a follicle will go through is predetermined at around 25-30 complete cycles. Is there any genetic evidence to validate this claim? How can ...
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481 views

Why do hair on head not get pilo-erected?

Whenever we have "goosebumps", there is a momentary piloerection, due to which hair on our elbows and legs get "erected" and "stand" almost perpendicular to the surface of our skin. But why do our "...
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75 views

What is the evolutionary advantage of the Mane?

Horses, Donkeys, Antilopes and Bovines seem to have an evolutionary advantage in growing masses of hair on top (and sometimes below) the neck. Is that to hinder predators biting?
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50 views

Why are there sporadic lightly pigmented hairs in facial hair?

My body and scalp hair are entirely black. Until recently, I thought this was the case with my facial hair also, until I noticed a small handful of hairs that were anywhere from light brown to copper-...
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Can hair follicle miniaturisation affect hair color?

We all know that follicle miniaturisation affects hair texture, making it look thinner(the hair shaft/root itself will be thinner), but does it affect hair color as well? So if an individual has thick ...
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73 views

Why does the scalp hair become grey first?

I understand that when the hair follicles produce less melanin or stop producing melanin altogether, hair becomes grey. But it seems like it is the scalp hair that becomes grey first. If follicles are ...
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556 views

Why do some men have patchy beards?

Why do some men have patchy beards? Or more specifically, why would some hair follicles lack sufficient 5-alpha reductase while others nearby don't when their genetic code is identical and they are ...
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56 views

Would it be possible to create a gel, holding viruses, that could alter the human genome when rubbed in?

I was wondering if it could be possible to engineer a virus, that when it comes into contact with human hair follicles, it could alter someones natural hair color. Naturally blue hair anyone? ...
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49 views

Does the use of a Thiazide diuretic affect the ability of a hair follicle to absorb substances?

Thiazide diuretics are on the World Anti Doping Agency's, as well as the International Olympic Committee, list of banned substances due to it ability to mask illegal substances in urine. The rapid ...
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How can I extract DNA from horse hair?

For my project I have to find an inexpensive, quick and simple-to-use method to extract DNA from horse hair. The sample does not have to be purified because the sample will be used for LAMP and not ...
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144 views

If what we eat can be seen in our hair, then to what degree can our food affect the “look and feel” of our hair?

It looks like most things (or everything?) that we consume, whether it is a food, drink, or something we smoke (like e.g. some drug like marijuana) ends up in some amounts in our hair. If this is the ...