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Tingkai
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To find the Northwest Passage
Aug 2001 time: 13:28
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quote: Originally posted by GP
Ting, yes. I'm sure that the actual story of genetic effects is more complicated than black/white. There are significant ethnic subgroupings in each "race" and these groups have variances in genetic endowments. But if you accept that idea, it seems like more of a support for the idea that there are general racial differences as well. |
No, accepting that there are noticable hereditary differences within a small group of people does not mean there are noticeable hereditary differences among races.
It's all about the law of averages.
Hereditary traits can be quite pronounced within one family, but far less so within a static community and none existant within a race of billions of people.
Children with tall parents are highly likely be tall. Dutch people are generally tall, but not all Dutch are tall. And just because the Dutch are tall does not mean that all white people are tall.
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Tingkai
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To find the Northwest Passage
Aug 2001 time: 13:28
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quote: Originally posted by GP
x is nature (genes). y is nurture (environment to include diet, and physical environment). You also need to differentiate between the time scale of an effect on a person and that on a population. There are different effects going on. (Watch out for Lamarkian fallacies.)
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Ironically, I think it is your theories that fail to see the difference between a person and the overall population.
Genes are set for a person, but differ significantly in a population, and more importantly, change over time.
You describe x as being nature (genes), but genes are very much a component of culture.
White society tends to link tall height with power (most executives in the US are taller than average). That's largely because white European society has been a warrior society. So people would subconsciously want tall kids. Tall men would be perceived as more attractive or better potential fathers. Evolution in this society has therefore led to tall people.
The same is not true in Chinese society where intellectual ability (passing civil service exams) has been the determinate for success for over 1,000 years. Height is not important and that why height differences have developed and continued between the north and south.
In Africa, some societies may have placed an emphasis on speed resulting in people being faster than average. However, this cannot be said of the entire black race just as it is incorrect to say that all Chinese are tall or that all are short.
Diet is also a major determinate. A person could have "tall" genes, but they will be stunted if they are malnurioused during childhood.
Similarly a white person could have the muscles to be the faster person on earth, but simply not be in a society where those muscles would be used.
As for your animal suggestion, yes, humans are different for the simple reason that for thousands of years, humans have worn clothing. Our bodies do not need to adapt to a cold environment because we can simply put on clothes.
Animals are also hunter-gathers, most of humanity is not.
Humans deliberately breed animals. The variety of dogs have substantially increased during the last 200 years or so. The same is not true of people.
So a person's height is a function of culture, diet, genes, and to a less degree environment. Or F=f(w,x,y,z) where
w= genes,
x = physical environment,
y = diet,
z = culture.
W is actually a subcomponent of z. X is becoming less important due to the advent of indoor heating and air con.
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Tingkai
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To find the Northwest Passage
Aug 2001 time: 13:28
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quote: Originally posted by Berzerker
Tingkai -
Yes, people who've lived near the equator on hotter savannahs for long amounts of time tend to be much taller. You've been citing examples of short people who live farther away from the equator (Bushmen) or in tropical forests (pygmies).
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So the Dutch who are tall live near the equator? And the northern Chinese?
quote: Originally posted by Berzerker
We'd need proof of their ancient ancestry before drawing such a conclusion.
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Why? The Southern Han Chinese moved to the south from the north. They are descended from the same people. Yet, they have different average heights.
Anyways, the ancient past is not significant. Average heights have changed rapidly in the past century due to vastly improved diets.
Genes are just not that important.
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