Poll: Is evolution tested
Yes
Not yet
[Show Results]
 
Testabel Evolution
Post Reply
 
Thread Rating:
  • 0 Votes - 0 Average
  • 1
  • 2
  • 3
  • 4
  • 5
19-03-2013, 08:24 PM
Testabel Evolution
The idea of humans being divided up by race or ethnicity is certainly a made up idea/belief that liberals and conservatives are happy to exploit but that is a different issue.

The invention of the Jewish people and the invention of the white race are good books that show that the idea of race is completely made up for imperialistic ends for the most part.
Find all posts by this user
Like Post Quote this message in a reply
19-03-2013, 08:53 PM
RE: Testabel Evolution
Hey, Chas.

You know I love to quibble..... Cool ........

Quote:It is largely unimportant genetically.

Utterly unimportant Cool

Hey, I.

Race is a cultural construction. But then again, so are political borders. So social constructions can have powerful ramifications. We just have to ditch the shitty ones whenever we can.

Race has got to go!

For myself, gender is the ideology I'm trying to scrap at the moment.

I think the single worst example of the arbitrariness of assigning race for imperialistic purposes and it's sad effect is Rwanda. The Belgians invented the Hutu and Tutsi designations out of thin air. Years later, one butchered 800 000 of the other in 100 days.

Peace and Love and Empathy,

Matt
Find all posts by this user
Like Post Quote this message in a reply
19-03-2013, 09:12 PM
RE: Testabel Evolution
(19-03-2013 08:53 PM)Ghost Wrote:  ...
borders. So social constructions can have powerful ramifications. We just have to ditch the shitty ones whenever we can.
...

It is not easy to see everything (and I mean everything) as a continuum.

Categories are useful, after all.

Here is one social construct that I think is holding us back...

Life vs. non-life.

I'd like to see that one go.

Find all posts by this user
Like Post Quote this message in a reply
[+] 1 user Likes DLJ's post
19-03-2013, 09:15 PM
RE: Testabel Evolution
(19-03-2013 09:12 PM)DLJ Wrote:  
(19-03-2013 08:53 PM)Ghost Wrote:  ...
borders. So social constructions can have powerful ramifications. We just have to ditch the shitty ones whenever we can.
...

It is not easy to see everything (and I mean everything) as a continuum.

Categories are useful, after all.

Here is one social construct that I think is holding us back...

Life vs. non-life.

I'd like to see that one go.

It began years ago. Pet rocks. Yes

Skepticism is not a position; it is an approach to claims.
Science is not a subject, but a method.
[Image: flagstiny%206.gif]
Visit this user's website Find all posts by this user
Like Post Quote this message in a reply
[+] 1 user Likes Chas's post
19-03-2013, 09:29 PM
RE: Testabel Evolution
Hey, DLJ.

Plato said it 2 000 years ago and it's still taught today. We are never, ever, outside of ideology.

Categories are hella useful. They just have to be constantly revisited.

Peace and Love and Empathy,

Matt
Find all posts by this user
Like Post Quote this message in a reply
19-03-2013, 09:48 PM
RE: Testabel Evolution
Hehehe, tell me about it.

They are not only useful but they help me make a living i.e. teaching how to categorise and then how to manage the different categories.

The problems occur when a bias or 'morality' or in-groupynessosity is attached to a category.
In my field we call it the 'silo' problem.

It would be nice to evolve away from that.

Find all posts by this user
Like Post Quote this message in a reply
19-03-2013, 10:14 PM
RE: Testabel Evolution
(19-03-2013 06:37 PM)Ghost Wrote:  Hey, I.

Shit, brother, skin colour's a gimmie Cool

Human skin has melatonin. Melatonin serves a number of purposes. But the two biggies are:
1 - Sunblock
2 - Happiness

Melatonin blocks ultraviolet radiation, which left unchecked, can cause mutations in cellular DNA. The higher the amount of direct ultraviolet radiation striking the skin, the more UV radiation needs to be absorbed. Humans with the most melatonin have the best survival odds in a place where there is a ton of direct sunlight. Like the African Savannah where humans come from.

Melatonin offers a brown pigmentation to the skin (without which the skin looks pink due to the subcutaneous blood: see albinism). The more melatonin, the darker and more brown the pigmentation.

The first humans that lived in Africa had very dark pigmentation because there was a ton of direct sunlight.

To be clear, they didn't develop dark skin BECAUSE there was direct sunlight. That is to say, they did not perceive a problem and then design a solution for it. Those individuals that were born with the alleles for more melatonin had a better chance of surviving to the age of reproduction. Those that had paler skin didn't reproduce as much. Over time, the frequency of the dark skin allele approached 100% across the continent as a DIRECT RAMIFICATION of the selection pressure of direct sunlight.

Melatonin also produces vitamin D (which is actually a hormone, not a vitamin). Vitamin D aids in a number of processes, like calcium and phosphorous absorption. A vitamin D deficiency leads to depression (see seasonal affective disorder) and to more serious conditions like osteoporosis, rickets and even death.

Vitamin D is an essential vitamin, meaning that the body cannot produce it from other compounds inside the body. All essential nutrients must be taken into the body in their whole form. Vitamin D is a little different because it's produced in its whole form by the body. That being said, the skin requires sunlight to produce vitamin D.

When there is less available light, dark pigmentation becomes a liability because it filters out too much light, meaning that the body cannot produce enough vitamin D. In low-light climates (where the sunlight strikes the atmosphere at a sharper angle than at the Equator; ie, North), it's more adaptive to have less melatonin. The less melatonin one has, the lighter, and closer to pink, their skin is.

This is why environmental factors like direct sunlight (in greater or lesser quantity) acts as a selection pressure for skin pigmentation.

Furthermore, by mapping the migration of mankind out of Africa by tracing mitochondrial DNA, one of the haplogroups settled in the Caucus Mountains. This group encountered high altitude, low-light conditions. In those conditions, humans with dark skin reproduced less frequently than those with pale skin, which is why the frequency of pale skin alleles approached 100% in the Caucasus. It is THIS SPECIFIC GROUP that shed their melatonin, wound up with pale skin and came to be known as the Caucasians. From the Caucasus, they migrated West into Europe (where they encountered Neanderthal man prior to the extinction of the species) and settled.

The differences between the dark skinned humans in Africa and the pale skinned humans in Europe is a perfect example of genetic drift. Populations whose gene pools are separated by space-time build up differences in allele frequencies.

I am an example of genetic flow.

When my pale skinned mother mated with my dark skinned father, the allele pair that I inherited (one for pale skin, one dark skin) entered an incomplete (or partial) dominance relationship. Thus my skin tone, a 100% sexified caramel brown, is a MIX of the colours from both alleles (an intermediate phenotype).

This is also why there is NO GENETIC BASIS FOR RACE WHATSOEVER. Skin colour is a product of allele frequency and genetic drift. That's it, that's all. The moment you reintegrate these populations, the skin tone alleles flow freely back and forth.

Peace and Love and Empathy,

Matt
You sure know a lot about MELANIN...

Melatonin is associated with sleep... And its pretty good stuff. Sleepy Zzzz
Find all posts by this user
Like Post Quote this message in a reply
[+] 2 users Like WeAreTheCosmos's post
19-03-2013, 11:01 PM
RE: Testabel Evolution
(19-03-2013 06:37 PM)Ghost Wrote:  Thus my skin tone, a 100% sexified caramel brown, is a MIX of the colours from both alleles (an intermediate phenotype).
Mmmmmmmm, caramel Shy

Humankind Dodgy (a total misnomer)
Find all posts by this user
Like Post Quote this message in a reply
[+] 1 user Likes aurora's post
19-03-2013, 11:19 PM
RE: Testabel Evolution
Hey, Cosmos.






Dude, for real, in my head, as I was writing the post, I was all like, "Don't confuse them now," because someone I know is taking melatonin. So what do I do? D'oh!

Cosmos is 100% right. I blew it. It's melanin, NOT, I say again, NOT melatonin. My bad.

Peace and Love and Empathy,

Matt
Find all posts by this user
Like Post Quote this message in a reply
[+] 2 users Like Ghost's post
20-03-2013, 02:42 PM
RE: Testabel Evolution
Article out that someone studying birds has noticed what may be visible natural selection with wing length. Here is the MSM article, not the study, so read with caution:

http://houston.cbslocal.com/2013/03/20/study-birds-evolved-shorter-wings-to-avoid-cars/
Find all posts by this user
Like Post Quote this message in a reply
Post Reply
Forum Jump: