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

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1answer
308 views

Why did humans lose their fur?

The little amount of body hair humans have don't seem to be of much use for keeping warm. Our Simian cousins on the other hand sport thick furs. At which point during the species evolution and why ...
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votes
3answers
2k views

Why does hair grow after trimming but remains at a constant length after a while?

Some hair especially body hair regrows after trimming but stops growing after a while. What is the mechanism behind control of hair growth and how is the length limit determined?
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votes
1answer
95 views

If ALL the melanin in a person was pheomelanin [closed]

If ALL the melanin in a person was pheomelanin... What would change about their appearance and what would the health effects be from such a change?
3
votes
1answer
400 views

What hair color will result in someone inheriting both blond and ginger genes?

Both the genes for blond hair and ginger hair are recessive, so they need both parents to give the same gene for it to take affect. What happens when a person has 1 copy of a recessive gene and ...
2
votes
2answers
571 views

Iron deficiency anemia symptoms explanation

In my classes and on the internet, brittle nails and dry hair (or hair loss) are described as symptoms of iron deficiency anemia, but none explains the cause of such symptoms. Does anyone have any ...