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Evolution's Path May Lead To Shorter, Heavier Women
Hugh Pickens writes "Yale University researchers believe that if evolutionary pressures of sexual selection and reproductive fitness continue for another 10 generations, the trends detected in their study may mean that the average woman in 2409 AD will be 2 cm shorter, 1 kg heavier, will bear her first child five months earlier, and enter menopause 10 months later. 'There is this idea that because medicine has been so good at reducing mortality rates, that means that natural selection is no longer operating in humans,' says Stephen Stearns of Yale University. 'That's just plain false.' Stearns and his team studied the medical histories of 14,000 residents of the Massachusetts town of Framingham, using medical data from a study going back to 1948 spanning three generations, and found that shorter, heavier women had more children than lighter, taller ones. Women with lower blood pressure and cholesterol were also more likely to have large families as were women who gave birth early or had a late menopause. More importantly, these traits are then passed on to their daughters, who also, on average, had more children. The study has not determined why these factors are linked to reproductive success, but it is likely that they indicate genetic, rather than environmental, effects. 'The evolution that's going on in the Framingham women is like average rates of evolution measured in other plants and animals,' says Stearns. 'These results place humans in the medium-to-slow end of the range of rates observed for other living things.'"
I think evolutionary change is being stifled by both medicine and civilization. Reproductive "success" is not genetic anymore, its based on social factors. The goal of most humans is no longer to spawn the most progeny.
I come from a small backwoods town and women in these areas (e.g. low income, low education) have more children, and have them at a younger age. ( This is a generalization, no anecdotes please. And no I don't feel like looking up stats, maybe someone else can post some).
Also, regardless of the details, I hope TFA is wrong. Have you seen dwarven females?
skinny women are less fit hosts for a fetus than heavier women
Maybe they've got cause and effect the wrong way round. Maybe after the first baby, the women in this study put on weight. Women who didn't have children didn't gain weight so skewed the samples and results?
politicians are like babies' nappies: they should both be changed regularly and for the same reasons
It could just be that the Menfolk of Framingham fancy short fat women. Perhaps they're all short and fat as well.
Smivs on the intertubes!
1) The children will take some characteristics from their dads as well.
2) A few generations of people doing what you say and you might have a breed of humans more likely to rape.
Give that idiocracy shit a rest. It's not genetically dumber people who make more children, it's people lower on the social scale. As in, people in ghettos and immigrants. Poor education and poor nutrition (both which cause lower IQs) aren't genetically hereditary.
So-called smart people always confuse uneducated people with less intelligent people. Maybe they're not that smart after all.
You just got troll'd!
Giving birth earlier and later menopause all sound like things that would improve selective fitness... but the question is, if they really are selected for, why weren't they selected for five thousand years ago? (Lower blood pressure and lower chloresterol are two that I can understand perhaps a little better-- the problems with heart trouble may have not been quite so much of a problem ten generations ago, when most humans did a lot more physical exercise just to stay alive).
http://www.geoffreylandis.com
Ugly people = Morlocks?
Note that the GP's fertility measures is just average number of offspring. This is probably just due to the well known fact that the better educated and the rich often choose to have fewer children. I seriously doubt awkwardness has anything to do with it.
caritj.org
There is no genetic advantage to being sterile. Therefore, ants and bees do not exist.
It is also their job to go out of business, when they fail. But they have so many moles in your government (Geithner, Obama, etc.) that you will bail them out for the next 80 years - as they pay themselves bonuses off of your children's former college fund.
You need to look up the definition of "Stockholm Syndrome" - then look hard in the mirror at yourself.
"Flyin' in just a sweet place,
Never been known to fail..."
Except most people today are moving from ABSOLUTE poverty to a developed nation poor, does not mean that classes will not solidify over time as the rest of the world becomes fully developed like the west.
In the west we have a reversing trend, more people are getting poorer.
Social mobility cuts both ways (i.e. person in developed country gets job, x amount of workers lose their jobs in USA/Canada, Europe).
And considering the amount of underemployed unviersity educated people in the USA and Canada it's quite obvious that they are backsliding (i.e. goign backwards).
I just read a big article on it the other day I'll see if I can't find it.
Interesting! The thing about such debates is that all arguments are based on assumptions, assumptions which are difficult to verify. I'd be interested to see anything close to a graph showing the distribution of offsprings depending on household income/education btw!
You just got troll'd!
He's specifically talking about the USA. It's much easier to buy Little Debbies at Walmart than to buy the proper food at Whole Foods (i.e. "whole paycheck"). Part of what makes civilization work is easy, cheap access to stored grain products... exactly what makes you fat. Rich folks have access to better quality food, they drink half-caf-soy-lattes instead of Coke, they get hour+ lunch times to eat nicely prepared salads, not 30 minutes drive-thru... ect, etc. They also get discounts for those expensive gyms (and again flexible work hours to USE them). At the top end, they farm their kids out to nannies so they have time to go do social things and look pretty.
There's no need to bring Rush Limbaugh into this.
It's not universally true, but it is more or less an accepted fact.
Fertility rates are inversely proportional to income.
In the modern world there are a lot of reasons for this. The rich tend to have access to better education. therefore, they tend to try to start a career before a family (illustrated in comedic fashion by the Mike Judge movie Idiocracy). Then with their career dominating their lives, they usually only have a couple kids at the most.
More wealthy folks have better access to birth control. Again, better education plays into this. On the extreme end of the spectrum, you have folks who have superstitious beliefs. That doesn't help keep their fertility rates down any...
Economists and demographers have known about this correlation for centuries. And it's interesting because it goes across religions, across nationalities, race, and other factors. Poor Americans are just as likely to have a higher fertility rate as poor French, or Japanese. Poor Nigerians or Indians are even more likely because a poor American is fairly well off by Nigerian standards.
Side Rant: The Israelis in particular are worried about this effect because Israel is a democracy. And the Israeli Palestinians have a fertility rate several times that of Israeli Jews. Again, the average Israeli Palestinian is much poorer than the average Israeli Jew.
The Israelis are concerned because with the higher fertility rates of the Palestinian Israeli citizens, the Palestinians may become a majority in the "Jewish State" in a couple generations. This brings up all kinds of moral dilemmas for the Israeli government, who must try to balance it's commitment to a homeland for the Jews to it's commitment to democracy for all it's citizens.
A few minutes of on the Google came up with these:
http://www.economist.com/opinion/displaystory.cfm?story_id=14744915
http://www.economist.com/sciencetechnology/displaystory.cfm?story_id=14164483
http://www.cmaj.ca/cgi/content/full/177/8/846/F19
http://en.wikipedia.org/wiki/Sub-replacement_fertility
http://www.indexmundi.com/g/correlation.aspx?v1=67&v2=31&y=2004
Also, I have no idea why you brought Rush Limbaugh into this. I'm about as progressive a character as you're likely to meet. I don't know anyone that disputes this data.
Cause is another matter. Progressives would tend to contend that the reason is education, the nature of pre-industrialized societies, higher mortality rates among poor nations, the tempo of life in wealthy nations and classes.
And Rush would say they all want their welfare checks or something.
You're right about the lack of heredity for short-fatness though. It is environmental / cultural, not genetic.
Touch everywhere, even when inappropriate.
I heard that stupid people also reproduce more, so clearly all the intelligent people will dry up by 2409 as well!
She's 40, still hot and key point- has not yet had any kids! Yes that's right, it's the end of the line for her. If the hot chicks don't have kids- there will be no second generation of hot chicks. Meanwhile I see plenty of ugly chicks with babies walking around in Auckland New Zealand .. this boat is sinking.
Divide a cake by zero. Is it still a cake?
"Half way" means nothing when 10% of the people own 90% of the wealth.
It does mean that the classes aren't fixed - and that was the only claim I was making.