OK, I’m back. I have been swamped at work post-return from this aforementioned conference, so I have neglected anything SDMB.
Quite honestly, this whole thing has become kind of a semantics game. As usual, I am siding with the usual suspects who have kindly been responding to statements I made back on the first page, and have already provided nice answers to lucwarm.
To directly address lucwarm’s point:
Race, as it comes up in these debates, is a criterion used for defining characteristics between different sets of people beyond the defining racial characteristics that we can all rattle off. This is with what we have issues.
Let me be very careful here. Racial groups are defined by a set of characteristics (let’s call this set of characteristics set A, which includes things like facial/nasal structure, skin color, hair type, epicanthic fold). Some posters insist on taking people of set A and reading into this another set of characteristics (set B) – athletic and intellectual abilities come up most often.
tomndebb, Collounsbury, Tars Tarkas, and others including myself point out the fallacy in this. Given a group of people of shared characteristics set A, we have shown genetically that set A are the only things they have in common. We presume that apart from few hundred or so (WAG) genes polymorphic in determining set A, they won’t have much effect on the hugely multifactorial set B. After all, there are 30,000+ genes in the genome.
My hypothesis lies that set A just happens to be the traits evolutionarily selected for in different environments. That’s all that I’m saying. I could be wrong, it is just a hypothesis.[sup]*[/sup]
Now about my “hard and fast” thing. Genetic similarity is a very quantifiable thing. It is something that we can follow through population migrations, through generations, through population mixings. There is no scientific need to talk in nebulous terms about quantifiable data. There is no scientific need to talk in nebulous terms period. We have demonstrated over and over again that characteristics of set A have no correlation to the quantifiable genetic similarity. So set A becomes irrelevant to any conclusions we make to genes beyond set A. Especially to things like set B, which are mostly !set A.
I would say that the “harder” the science, the less we talk in nebulous terms like race. As an MD/PhD student, I function in both the hard science of molecular genetics and the softer science of medicine. It is kind of the goal of my program to be able to carry some of this hard science to the bedside. So, yes, nebulous terms without “hard and fast” definitions are less useful in science, and we should try to banish them where we encounter them.
In molecular genetics, or molecular anthropology, “race” has no utility. We have better terms. Go to softer science, and in it creeps. In medicine, see the great NEJM articles of last year for opinions of medical professionals trying to move beyond race, even though it has large utility as a classification scheme. This utility arises from its use in an even softer science – sociology. So when we say that African Americans have a greater mortality from prostate cancer, this has nominal, if any, genetic (hard science) component dependent or linked to set A characteristics[sup]*[/sup]. It has a tremendous sociologic component – diet, exercise, smoking, access to health care, environment, etc.
Does this make sense?
So what is “hard and fast?” I would say that if a definition is based on quantifiable data, is reproducible, stems from physiologic or anthropologic relevance, and is independent of observer bias, then it is pretty “hard and fast.” Race as a scientific concept does not fulfill these requirements. But I am not a philosopher of science. I am kind of shooting from the hip of working in the lab all day.
To grienspace:
No, I don’t know if it has been published. I was hypothesizing. It may not be true. The only data I have to support it is that common traits are found throughout common environments (i.e. dark skin in the tropics) and that genetic backgrounds are not shared. So, there must be a reason for common traits to be found across broad swaths of humanity. Add this into quantified genetic advantage from sickle cell trait and perhaps cystic fibrosis and Tay-Sachs carriage, and I made a leap. I will revise the specific statement about noses to more along your lines – pointier, narrower noses were selected in colder climes for increased warming, etc. etc., and never selected in warmer climes.
[sup]*[/sup] – I recognize that there are some traits at high levels in African American populations that are not what we would call racially defining traits. Things like G6PD, SCD, and perhaps genes involved in carcinogenesis. But I stick by my hypothesis – these alleles were for whatever reason evolutionarily selected for in diverse populations sharing an environment. To support this, as pointed out numerous times, Mediterranean people share malarial resistance traits such as SCD and G6PD. The trait follows the selection criterion, not the “race.”