Don't like the implications?

[Warden_of_the_Storm]

Why don't you take that advantage?

What on Earth does that even mean?

 

[Speedwell]

What on Earth does that even mean?

Juvenissun thinks that individuals evolve during their lifetimes.

 

[Warden_of_the_Storm]

Juvenissun thinks that individuals evolve during their lifetimes.

... wow. Even for him, that's bad.

 

[juvenissun]

Probably, but I've been there and seen them.

I have not. I like to see a scientific report on that.
I suspect the cause of the dark skin are different between the two.

 

[juvenissun]

You may find it interesting to read the wiki page on dark skin. It describes how skin color is a direct adaption to the amount of UV radiation at the place of settlement, and how populations can lighten and re-darken as they move around. Here is a quote:

So you suggest black people can lighten their skin color in how many generations?

I do not believe that and like to see an actual example or experiment on that.

Many black Americans are still quite black even their ancestors lived in the North America for two hundred years.

 

[Speedwell]

I have not. I like to see a scientific report on that.
I suspect the cause of the dark skin are different between the two.

No, it's all due to the amount of melanin.

 

[juvenissun]

Actually, they come in a variety of shades. And there are other dark colored people--Australian aborigines come to mind--who are generally darker than most Africans.

Why is that?
And why should there be dark color people in Australia, but not in Indonesia or central America?

 

[juvenissun]

No, it's all due to the amount of melanin.

Why would the amount of melanin be different?

 

[Warden_of_the_Storm]

This... has seriously stopped being funny. This has turned in to something horrifyingly tragic. No-one can be this dense on such a simple subject!

People with darker skin live in areas of the world where there is a higher amount of UV radiation because of large amounts of sunlight. It is that blooming simple!

 

[FrumiousBandersnatch]

Many black Americans are still quite black even their ancestors lived in the North America for two hundred years.

Two hundred years is only roughly between 6 and 9 generations on average, not enough to show significant changes. Human populations dispersed across the globe over tens of thousands of years.

 

[FrumiousBandersnatch]

This... has seriously stopped being funny. This has turned in to something horrifyingly tragic. No-one can be this dense on such a simple subject!

People with darker skin live in areas of the world where there is a higher amount of UV radiation because of large amounts of sunlight. It is that blooming simple!

It shows that a lack of general biological knowledge can seriously affect one's understanding of evolution and examples of evolution. The only solution is education, but there is often a bias against learning things that might undermine existing beliefs...

 

[Gene2memE]

2014 research paper: https://www.sciencedaily.com/releases/2014/12/141205100058.htm

Edited highlights:

Skin colour varies according to the latitude and, therefore, according to the intensity of incident ultraviolet light: individuals living at low latitudes have darker skin, whereas those living at high latitudes have pale pigmentation.

Evolution is furthering mutations that are lightening the skin, probably owing to the need to synthesize vitamin D at latitudes where there is reduced solar irradiation (compared with Africa) although, in turn, this increases the probability of developing melanoma or skin cancer.

Identified two mutations that cause skin to become paler. Identified new genes and genetic variants that could be linked to the differences in pigmentation in our population.

The first hominids that appeared in Africa probably had pale skin covered with hair, like other primates. They are thought to have lost their hair when they became bipedal, and that natural selection subsequently furthered darker skins in Africa as they protect against ultraviolet (UV)light.

However, when humans left Africa (about 100,000 years ago) and headed for Asia or Europe, where UV intensity was lower, they once again acquired a less pigmented skin colour.

What caused the depigmentation of these populations is not clear, and two hypotheses have in fact been put forward: firstly, it could be due to a relaxing in natural selection that keeps the skin dark in Africa, since when leaving Africa, UV levels are lower; secondly, it could be due to the fact that natural selection furthers certain mutations so that individuals can have paler skin, since at these latitudes having a skin with a dark pigmentation prevents the synthesis of adequate levels of vitamin D, essential for our survival.

Human skin pigmentation chart:

 

[Herman Hedning]

So you suggest black people can lighten their skin color in how many generations?

I do not believe that and like to see an actual example or experiment on that.

Many black Americans are still quite black even their ancestors lived in the North America for two hundred years.

As was stated in the quoted material in my post, in 100-200 generations. That's about 2000-4000 years, so it's not really feasible to verify it by direct experimentation. And the 200 years you refer to is only 10 generations at the most - way too little to make a clear difference.

 

[juvenissun]

Two hundred years is only roughly between 6 and 9 generations on average, not enough to show significant changes. Human populations dispersed across the globe over tens of thousands of years.

That is the problem. And I take it as a convenient excuse. We can not observe it, can not prove it. All we have is a model. That IS what the evolution is.

 

[juvenissun]

2014 research paper: https://www.sciencedaily.com/releases/2014/12/141205100058.htm
Human skin pigmentation chart:

Our children is poisoned by this kind of overly simplified information. We NEED to tell them that there are MUCH MORE exceptions than the presented explanation.

Why is the skin of Australians so dark? But not people in the Sahara desert?

 

[Speedwell]

Our children is poisoned by this kind of overly simplified information. We NEED to tell them that there are MUCH MORE exceptions than the presented explanation.

Why is the skin of Australians so dark? But not people in the Sahara desert?

Obviously you are looking for some entirely different explanation. Do you have any idea what it is?

 

[Gene2memE]

Our children is poisoned by this kind of overly simplified information. We NEED to tell them that there are MUCH MORE exceptions than the presented explanation.

Why is the skin of Australians so dark? But not people in the Sahara desert?

Why don't you do your own research on this topic, and find out?

 

[Jimmy D]

Our children is poisoned by this kind of overly simplified information. We NEED to tell them that there are MUCH MORE exceptions than the presented explanation.

Why is the skin of Australians so dark? But not people in the Sahara desert?

I agree with Gene2meme, go and do some research if you are genuinely interested (which I doubt). I just did a quick google search and there are many, many papers on the subject.

I am curious as to why you are not convinced by the explainations you are being offered, do you believe that there is a more plausible alternative?

 

[juvenissun]

Obviously you are looking for some entirely different explanation. Do you have any idea what it is?

No. I don't think there is a good explanation to the question.

 

[TagliatelliMonster]

No. I don't think there is a good explanation to the question.

I note that you haven't bothered to respond to my post (post 186: http://www.christianforums.com/threads/dont-like-the-implications.7973420/page-10#post-70384244), where I answered your questions concerning races of humans and why a single race doesn't evolve multiple times and/or in multiple locations independently.

Did you miss it?
Did you not read it?

Or are you just ignoring it?