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why Australian Aborigenes have straight hair
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[QUOTE]Originally posted by zarahan- aka Enrique Cardova: [QB] [b]straight hair is predominant in regions much closer to Africa[/b] Straight hair is predominant in regions very distant from Africa as well. Artic peoples have straight hair for example. [b]Theory: somewhere in the Middle East/South West Asia straight straight hair became predominant in most humans[/b] ^^Do you have any credible scholarship to back up this "theory" of yours? [b]People there have mainly straight hair. This may have been an adaptation to colder tempratures (esp nightime)[/b] ^^Sources in support? And if straight hair depends on colder temperatures, then the cold nighttime temperatures of African deserts would fit the bill based on your own argument, as well as the cooler high altitude zones as in many places of East Africa. [b]It is theorized that afro kinky hair is an adpatation to humidity. [/b] There is also a flaw in your theory. If humidity is responsible for kinky hair, why do peoples in hot, humid tropical jungle environments as in parts of Asia and South America have straight hair? Parts of Ecuador, Columbia and Brazil, and in Asia- Indonesia, sit on the equator for example, in the tropical zone, yet many of the native peoples of these regions have straight hair. How do you explain this? Provide credible scholarly sources with your response. [b]People start out in a tropical hot humid environment, they leave and are transformed by the realtively colder/drier climate like Iraq or Iran but later go agian into a higher UV environment like South India (same latitude as Sudan) They retain the straight hair from before but acquire dark skin. The same would be true of Austrailians. As people pass through different climates they can retain some traits before reaching a final destination.[/b] According to your theory, everyone started out with kinky hair in Africa, left Africa and "switched" to straight hair, and never go back kinky evermore. But if so, why do populations in Papua New Guinea and other parts of the pacific and even India have kinky hair, in proximity with straight hair populations? Papuans and Indonesians are a few hundred miles apart depending on the territory analyzed but a highly variable hair mix exists. Why? According to your theory, when they left Africa and "switched" to straight hair, they should not have "gone back" to kinky. And why would they lose dark skin, yet retain straight hair? What gene or envuironmental variable is responsible for this strange mismatch? Please elucidate with credible sources to explain this mystic theory, not just your "feelings" about it... [/QB][/QUOTE]
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