Why do people go bald?

Discussion in 'Biology & Genetics' started by John J. Bannan, Jul 6, 2007.

  1. guthrie paradox generator Registered Senior Member

    I think that canine hair shedding will also be due simply to the fact that their hairs will grow to a certain length and then drop out, same as ours do. Otherwise dogs would be huge fluffy balls of fur.
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  3. valich Registered Senior Member

    No this is not the case. Most, if not all?, breeds that originated near the equator or in hot temperature regions with maximum sunlight do not shed at all; for example, the Mexican Hairless, Egyptian Pharaoh Dog, and Barenji (moderate shedding in some areas when brought up North - originated in Central Africa). Conventional theory has it that it is tied to melatonin because you will never see a Northern breed dog shed its coat in the winter near Arctic areas, less it perish from the cold without a coat. This has nothing to do with the length of time it takes to regrow the fur. It is a seasonal cycle. the problem is that if it is tied to melatonin, which will vary with temp and light, then why doesn't the cycle change when you take a Northern breed dog and place it in the Southern Hemisphere where the winters occur when our summers occur. They still shed during our summer season even though it is winter down under. This doesn't make sense.
    Last edited: Jul 22, 2007
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