Diminishing races, growing family

In the January 22, and 2009 edition of Nature (available only to subscribers online), Aravinda Chakravarti explains that our simplistic notions of "population" and "race" will need to be revised as we enter the age of "personal genomics." Chakravarti teaches at the Johns Hopkins University School of Medicine. Traditionally, we've used geological records to trace our family histories. We are now approaching a time where we will be able to use DNA databases. Whereas our traditional human records take us back several hundred years, our genomes will allow us to explore our ancestry for hundreds of thousands of years. Chakravarti argues that we will be entering unknown territory riddled with surprises and stretching the meaning of the word "family." How close knit is our human "family"?

All living humans are related via a set of common ancestors who lived in Africa about 200,000 years ago. Other studies have since shown that the world beyond Africa was settled even more recently. From 100,000 years ago, descendants of our African forebears spread out to populate other continents . . . the striking implication of this is that all living humans are mosaics with ancestry from the many parts of the globe through which our ancestors trekked. In other words, each of us has around 6.7 billion relatives.

Chakravarti points out that our genealogy-based record-keeping is often riddled with error. It fails to indicate our interrelatedness to each and every other human being, for example. Further, evidence shows that at least one out of 20 people do not know the identity of their genetic father. Thanks to the falling cost of examining entire human genomes (Chakravarti indicates that it has fallen 1000- fold or more), we now have abilities we could only have dreamed of a few decades ago. Personal genomics might well destroy our simplistic notion of "race." Human populations are not intact groups. There is no such thing as genetically characterized racial categories. We are all "multiracial, related to each other only to a greater or lesser extent." Detailed surveys are making it clear that there is no such thing as a discrete racial group. Rather, it is clear that there is a "continuity in variation across the globe, not abrupt transitions between population-specific sequence patterns." Personal genomics would allow us to focus on individual human beings, instead of artificially constructed "racial" populations.

Genome-wide studies ... could result in the individual identity and kinship coming to define populations rather than the other way around. We could test once and for all whether genetic race is a credible concept. This would be tremendously exciting. It is bound to stir up our deeply held notions of who we are, where we came from, our history and thus our politics. .. . it may be time for science to reshape the views of society. By dismantling our notions of race and population, we may better appreciate our common shared and recent history and perhaps more importantly our shared future.

I recently posted on the topic of whether science should study race and intelligence. I think this would be a worthy topic of science (just as is every other potential field of study), but I warned that our current definition of "race" is horribly muddled. We need to get clear on this term, if that is even possible. I found Chakravarti's article to be a refreshing reminder that there might not even be a worthy scientific definition of "race." In fact, it might well be that, once we look carefully at the evidence, we will find that there are actually 6.7 billion "races" out there. Or is it more accurate to conclude that there is only one human race?

Continue ReadingDiminishing races, growing family

A Master’s in Creationism

LOL*cough* Excuse me. I nearly choked on a handful of almonds. My created/intelligently designed oesophagus is just a little too close to my trachaea, making it very easy to block the latter with particles of chewed food whilst laughing my arse right off its hinges when I read stuff like this FOX article:

State Rep. Leo Berman (R-Tyler) proposed House Bill 2800 when he learned that The Institute for Creation Research (ICR), a private institution that specializes in the education and research of biblical creationism, was not able to receive a certificate of authority from Texas' Higher Education Coordinating Board to grant Master of Science degrees.
So. "Education" and "research" (grin) of biblical creationism (chortle). OK, well, although I'm no theologian or creation scientist (snort) , allow me to sum up the entire proposed course for you: Education: God did it. Research: it says in the Bible that God did it. Thesis: the Bible says God did it; the Bible is always right because God wrote it; God is always right; the evidence for this is in the Bible which God wrote; my conclusion is that God did it (and is always right, just like the book He wrote). Well done, here's your diploma & whimsical "WWJD" t-shirt that all the kids are wearing. That'll be several thousand dollars. Hmm?

Continue ReadingA Master’s in Creationism

Cloning is a Silly Issue

As with Prohibition and Abortion, the Stem Cells and Cloning issues are handy distractions from real issues of national import, like infrastructure, economy, and war. The War on Drugs is every bit as successful now as was Prohibition in the 1920's. Abortion is a medical procedure that blatantly favors the rights of the host over the cluster of human cells growing within. Although abortion is periodically effectively outlawed, its incidence is never significantly reduced. Oddly, to mention stem cells brings a knee-jerk retort of "Cloning!" from some quarters. Cloning is only a dangerous issue to those who don't actually know what it is. Let's suppose that the technology were developed to create a healthy baby genetically identical to an existing adult. It would be an expensive procedure, and necessarily take as long as a normal gestation. But mutations occur with every cell division, so the original cloned blastocyst would be subtly different than the donor's original blastocyst, however perfect the methodology. The clone would also be raised in a different family, so we are now slightly farther apart then identical twins raised apart. Much more significantly, the gestation would be in a different environment (womb, timing, nutrition) creating many significant physical developmental differences between donor and clone. I laugh when movie clones have all the same freckles, scars and other developmental marks as the donor. A perfect clone would resemble the donor much like a normal sibling raised separately. Why would anyone bother? Even with livestock. The genetic and health dangers of monoculture tree and vegetable farming are bad enough as a cautionary tale. Most people well enough educated to develop cloning know enough about the principles of evolution to know that duplication of a genome (however ideal it may be) in bulk is a Very Bad Idea. But cloning research is a different issue. The research has very high potential for serendipitous results. As with the accidental discoveries of antibiotics and Teflon, one can only find things by looking for something in the same area, but rarely for the thing itself. Some of the possibilities include: * Growing cloned organs in vitro or in a host. Crichton wrote Congo based on the idea of cloned organs raised in host animals. * Learning enough about gestation to create artificial wombs would be of enormous benefit to premies and other medical problems. * Knowing how to start and stop cell and organ development could well lead to regrowing limbs and teeth and other organs directly in the host. Some legislators are moving to block such research, in case it may lead to the possibility of someday making a clone. But why? Soul? Find me two theologians who completely agree on when and where a soul is created and when it enters a body. Now find me as many who agree as scientists who agree that the soul is a product of biological structure and heuristic experience, a quickly growing number.

Continue ReadingCloning is a Silly Issue

Richard Dawkins discusses The God Delusion on Minnesota Public Radio

Richard Dawkins, the evolutionary biologist and author of The God Delusion, has spent countless hours defending his positions before lay audiences. What’s really impressive about Dawkins is the way he keeps his cool under fire (I was first impressed with Dawkins' composure when I viewed this episode, involving Dawkins' interview of the gay-bashing hypocrite, Ted Haggard). Consider this condescending interview conducted 3/4/09 by Kerri Miller of Minnesota Public Radio. You can listen to the entire one-hour interview here. At the beginning of this interview, Miller could barely hide her disdain for Dawkins. Many of the people calling the show to ask questions were much more open-minded than the host--they certainly didn't pick up the host's mocking tone. Miller began the interview by branding Dawkins a failure because people weren’t running to convert to atheism, despite Dawkins’ hope (expressed in The God Delusion) that people reading his book would be caused to rethink their beliefs in religion. Dawkins explained that he did hope that people would rethink their beliefs, but that his book didn’t fail merely because people didn’t abruptly quit their religious affiliations. Here's the hope Dawkins expressed when he wrote The God Delusion:

I hope to persuade . . . a substantial number of middle of the road people that there’s nothing wrong with a disbelief in God … there’s nothing outlandish about it. It’s probably what they’re like anyway, whether or not they admit it to themselves.

Miller then worked to corner Dawkins with a belief expressed by theist John Polkinghorne that there are no hard and fasts truths. Dawkins agreed with Polkinghorne on this general point, but advised Miller that this doesn’t mean that we have no understanding of anything.

Continue ReadingRichard Dawkins discusses The God Delusion on Minnesota Public Radio

Handy list of transition fossils: seven missing links for handy reference

I've often wished that I had a short list of impressive transition fossils handy for the next time a creationist claimed to me that there were no such transition fossils. Well, here's the list I've been looking for, published by the National Geographic. The first fossil on National Geographic's list is the especially compelling find, Tiktaalik, the "fishopod."

Continue ReadingHandy list of transition fossils: seven missing links for handy reference