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While the mammalian Y chromosome (males only) may be much smaller than the X chromosome that predominates in females (males have one X, females two), this males only chromosome is evolving much faster. As a result male primates were found to be evolving faster than females.  (Source: Nature.com)
The Y chromosome is evolving fast to deal with genetic pressures of varying mating habits, such as chimp group mating

Modern biochemistry and genetics is just beginning to unlock the complex secrets of evolution, the process in which organisms change over long periods of time through random genetic variation and selective pressures.  With a handful of genomes sequenced, scientists can now start mining this data to find interesting trends and evidence of the course evolution is taking, particularly in humans.

A provocative and intriguing new study reveals that past thought on the Y chromosome, the chromosome that instructs mammals to develop into males, may be entirely flawed and that the chromosome, previously thought to evolving at a crawl, may in fact be evolving far faster than other chromosomes.  Human females typically have two X chromosomes, while males have an X and a Y chromosome.

It was previously thought that autosomes (non-sex chromosomes) and the X sex chromosome featured greater diversity (faster evolution) than the Y sex chromosome, a smaller chromosome.  According to the new study, led by Jennifer Hughes, a postdoctoral researcher in Whitehead Institute Director David Page’s lab.  The research indicates that primate males may be evolving significantly faster than females.

To determine how fast the Y chromosome was changing, the scientists needed a point to compare our Y chromosomes against.  The human Y chromosome had been comprehensively sequenced by the Page lab and the Genome Center at Washington University in 2003.  A promising target was DNA from chimpanzees -- a close relative of humans on the evolutionary tree.  However, the 2005 sequencing of the chimpanzee genome excluded the Y chromosome, mostly, due to its hundreds of repeating sequences that threw off sequencing techniques at the time.

Undeterred, researchers at the Page lab and Genome Center at Washington University completed sequencing the chimpanzee Y chromosome, using newer techniques.  What was discovered was amazing.  The Y chromosome, thought to be a musty unchanging stretch of genes had changed significantly between humans and apes in terms of structure and content.  Approximately one third to a half of genes found in the human version of the chromosome were lost in the chimp chromosome, since chimps diverged from humans in the evolutionary tree.

Professor David Page compares these changes to a constantly renovated home, stating, "People are living in the house, but there’s always some room that’s being demolished and reconstructed.  And this is not the norm for the genome as a whole."

Wes Warren, Assistant Director of the Washington University Genome Center, another top genetics expert, agrees that the findings are extraordinary, "This work clearly shows that the Y is pretty ingenious at using different tools than the rest of the genome to maintain diversity of genes.  These findings demonstrate that our knowledge of the Y chromosome is still advancing."

One thing that may be driving faster evolution of the male sex chromosome is differing mating habits between species.  Where as humans typically take a single partner during sexual intercourse, numerous chimpanzees often mate with a single female in a short time period.  Males who produce more sperm, or whose sperm is better at impregnating females will have a better chance at beating the other males' sperm and passing on his genes.

To give an idea of just how profound this effect is, the difference between the rest of the human and chimp chromosomes is only 2 percent.  That means that the male sex chromosome is evolving nearly 15 times faster, or more, on average than the female genome.

The Page lab and the Washington University Genome Center are now looking at the Y chromosomes of several other mammals to further determine if this faster rate of male evolution is a characteristic of primates only, or other mammal lines as well. 

The study on the work was published in the prestigious journal Nature, and can be found here.

The research was funded by National Institutes of Health (NIH) and the Howard Hughes Medical Institute (HHMI).

Where as chimps have evolved to cope with the genetic pressures of group sex, human males and females have evolved on a different course.  Recent research indicated that human females are slowly evolving to be shorter and to carry more weight.


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RE: Study based on unproven assumptions
By Belard on 1/14/2010 3:11:42 PM , Rating: 1
I don't think your post appeared out of thin air.

quote:
Think about it, creation is actually quite logical as humans have created and continue to create millions of items, computers, cars, etc.


Yeah, *think* about it. Some guys from 1500~2500 years ago didn't know much about technology and such because they didn't have computers, high powered telescope or lasers so when their 8year old kid asks "why is the sky blue", they can say "God made it", because MAN didn't understand how the sun light was effecting the molecules in our atmosphere.

Hence, Mars *IS* not blue because its Atmosphere is not like ours.

So what MAN doesn't know, he pulls it out of his ass.

quote:
why couldn’t God with his superior intelligence create biological life


How do you know God is a He? There are certain facts that point that God is actually a black woman who really doesn't like it when men masturbate and watches every time it happens.


RE: Study based on unproven assumptions
By jahwarrior on 1/14/10, Rating: 0
RE: Study based on unproven assumptions
By Abrahmm on 1/14/2010 4:37:18 PM , Rating: 3
Um, we know why the sky exists. Gravity holds a gaseous atmosphere close to the surface of the earth.

So let me get this straight. You want to take the theory of evolution, which has a substantial amount of evidence supporting it with only a few things yet to be explained, and completely throw it out for a theory about a magical man in the sky that instantly created everything that has absolutely no evidence to support it in any possible way?

Yes, very logical thinking.


RE: Study based on unproven assumptions
By AntiV6 on 1/14/2010 6:20:41 PM , Rating: 2
Evolution and Creationism don't explain the same thing, btw.


RE: Study based on unproven assumptions
By Abrahmm on 1/14/2010 10:48:41 PM , Rating: 2
Technically not, but creationists tend to deny evolution based on their creationist beliefs.


RE: Study based on unproven assumptions
By AntiV6 on 1/15/2010 12:01:43 PM , Rating: 2
So, those people also say that humans evolved directly from chimps...

Mass ignorance doesn't make it true.

:P


By Belard on 1/15/2010 9:45:48 PM , Rating: 2
Are the same ones who might have come from chimps :)

Hey, when it comes to Dinosaurs, either
A: Dinos and man lived at the same time (cause the Earth is only 12,000 years old) - oh yeah, plenty of evidence to show Earth to be at least 5 billion.

B: Dinos were put into the ground to challenge mans beliefs in God.

Concept of time means little. Maybe some day, Santa will show us the way.


RE: Study based on unproven assumptions
By Belard on 1/14/2010 7:34:47 PM , Rating: 2
Well, you got 1 out of 2... The point was that early MAN, who did not understand HOW things work (gravity, energy, etc) - after-all, up through the 1800s, men thought that heat worked like a liquid. They also didn't know about blood types at first - they were puzzled when some of the first blood transfusions worked and some didn't.

quote:
Question 2. why does the sky exsist? God created it


PROVE IT

We have theories based off of viable science. Your Q#2 is based off stupidy / naiveness of men thousands of years ago.

This is why WE go to school, to learn. Otherwise, we're stupid monkeys with guns.

Er, we (intelligent men) developed computers, lasers, scopes that can allow us to see the BILLIONS (not hundreds or thousands) of Galaxies in the universe.

quote:
God is a he because Jesus is God

What are you? Seriously?

Its pretty bad when you guys don't even understand your own religion, its funny as hell. Lets do a little lesson plan, lets see if you can follow it. I won't hold your hand on this because your flaws are scary typical.

A: Question: how many Gods in your religion?

B: If Jesus is the Son of God, then Jesus CANNOT be God!

C: If Jesus is God (as you just stated), then he created himself... but that goes against the bible (of how many interpretations?).

D: "I am Second" campaign is flawed. Its a religious group in which Jesus is 1st and YOU are 2nd behind Jesus. er... okay, then God (creator of Earth & heavens) is 3rd? LOL thats some funny stupidity.

E: To be closer to Jesus, convert to Judaism.

F: If God is perfect and Man is created in his image, therefore God is... "A man", then (A) God is not a super-being or (B) if God was, as shown by mankind's stupidity, defects, health, war, murder, rape, etc then prove that God is imperfect and a rather sick individual with childish ego problems. As shown by your own faith: Worship me or *I* will send your to hell, EVEN thou I gave you free will because *I* Looooove you.


RE: Study based on unproven assumptions
By rdeegvainl on 1/15/2010 8:54:30 AM , Rating: 2
I beleive you are grossly ignorant of religions. To claim that he doesn't even understand his own religion when you do not know of which religion the person is, is quite frankly stupid.
All assumptions of whether any of this is true or not here are some answers to your crappy attack of christianity.
A:3, ever hear of the trinity, God the father, God the son, and God the holy ghost?
B: Jesus can be God, as all 3 are God.
C: Nope, God the Father and God the son explain that part.
D: You're point? Some peoples views do not reflect all others and may not even be this person's religious belief system
E: Do you screw your dad to be closer to your mother? No, you get to know the person, not do the things they do.
F: or C God created man in his own image, and not an exact 1:1 copy of himself and allowed them to develope their own brain and choices over time.
You're concept of hell also does not match everyones either.
It's either accept this God's payment for your sins or be full of sin in the presense of god when he returns, whereby sin is ungodliness and in the presence of god in is blazing glory one is destroyed forever...

Stick to science when you argue against religion.


By Belard on 1/15/2010 2:52:47 PM , Rating: 2
quote:
when you do not know of which religion the person is, is quite frankly stupid.


Its easy to figure out from his "Jesus" thingy that he's not: Islamic, Jewish, Buddhist, Shinto or Catholic. So no, it would be stupid to not be able to figure that out.

quote:
answers to your crappy attack of christianity.

I'm not attacking Christianity. Just stupidity and organized religion.

A: Ever hear "There is no God but God?" Just as meaningful, eh?

B: So, Gos has split personality disorder? My Son is not me, I am not my son. Jesus was not God, for God is only God. Filling two entities into the same title is stupid, er never mind, (bush & cheney were both president - duh)

C: So? It goes back to the stupidity of combining two people into one.

D: I wasn't being specific to the poster. I was explaining the stupidity of a religious marketing campaign that effectively puts their God below man. And BEFORE you go back to the God is he/Jesus blah, that campaign is supposed to be aimed at people who don't know/think they know the Bible.

E: But many Christians hate Jews. Thing is, the Christian Bible has been re-written over and over again (the new 2010 version!), while Judaism is still the same.

F: Or if God created everything; he created homosexuals, blacks, Islam, the air, malaria, fleas (explain why Noah saved the 2 Fleas), cancer, baldness, incest and more. If Adam & Eve were the first two humans, who did their children have sex with to reproduce? ewwwwwwwwwwww!
But in the end, your God has an ego problem in that if YOU choose to not follow the bible to the letter (you can't, due to interpretations and contradictory rules, ideas and stories) - you're damned. So wheres the love?

quote:
You're concept of hell also does not match everyones either.

Huh? Did I describe hell? I was going by the interpretations of the religions.

quote:
t's either accept this God's payment for your sins or be full of sin in the presense of god when he returns

So a child molester who rapes his own children and goes to Church twice a week is forgiven by God, but an Indian in South America whose never meet a white man goes to Hell? Sounds perverted to me.

Remember, white men from Europe thought the Earth was flat and that their ships would fall of the Edge of the world. Too stupid to understand the stars and the moon. Yet men from thousands to years before understood a lot more, even calculated the size of the Earth roughly. It was religion that taught those men that the Earth why flat. hmmmmmm.

quote:
Stick to science when you argue against religion.


Stick to Religion as it doesn't belong in Science, the Government or our schools.

The universe is full of more galaxies than there are humans. Never mind the 100~200 billion stars in our galaxy alone.


By Belard on 1/17/2010 4:58:36 AM , Rating: 2
Oh well.

Not much ammo about the AIR thing, eh?

Thinking about it, now I think that is the reason why religious people don't believe in pollution or global warming issues. Expecting the big guy above to magically fix the AIR and maybe create another planet or whatever to feed the people.


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