African-Americans are ideally suited biologically for quick bursts of speed because of a number of factors, such as lower natural body fat, more-efficient metabolism and muscle fiber type. "It's a strong genetic component what type of muscle fiber you have, either slow or fast" says Bengt Saltin, director of the Copenhagen Muscle Research Center, long considered the world expert in this field. "And West Africans [almost all African-Americans trace their primary ancestry to West Africa] have already 70 or 75 percent of the fast type when they are born."

Saltin is still hearing the political correct braying in reaction to his September cover story in Scientific American, "Muscles and Genes," which addressed many of these issues. The question of whether there are innate differences between races is customarily dismissed outright as racist. After all, aren't we all born equal, blank slates for culture and the environment to write on? "Very many in sports physiology would like to believe that it is training, the environment, what you eat that plays the most important role," says Saltin "But we argue based on the data that it is 'in your genes' whether or not you are talented or whether you will become talented ... The basis is in the genes of these runners. There is no question about that. The extent of the environment can always be discussed but it's less than 20, 25 percent. It's definitely a dominant factor how they are born ... I don't see this as a racist issue."

The emergence of black quarterbacks has less to do with the end of racist slotting of players (although quarterbacking is the last vestige of that prejudice) than with the need to respond to the increased speed and quickness of NFL defenses dominated by players of primarily West African ancestry. Race has been a factor, "but less and less over the years," agrees Tampa Bay coach Dungy. White quarterbacks who didn't fit the mold, such as Buffalo's Doug Flutie, never got much of a chance either, and were often forced to prove themselves north of the border. Dungy has been around the game long enough to recognize that the race question is often mediated through other issues.

"For a long time, the NFL had a mold that quarterbacks had to fit," he says. "Everyone was looking for a drop-back passer with a cannon arm who was relatively tall. If you didn't fit that mold, black or white, you didn't get much of a look. The few blacks who got a chance, like Doug Williams, fit that prototype."

The days when a classic drop-back passer like Roman Gabriel, Sonny Jurgenson -- or Doug Williams -- could sit in the pocket are over (with notable exceptions, of course, such as Kurt Warner). All the coaches are looking for "athleticism" -- a word that not too many years ago resonated with racial undertones, including "less intelligent."

"That used to be a code word to describe a black quarterback whom a coach wanted to shift to receiver or defensive back," says Minnesota coach Green, who is black. "Now, with the speed and strength in the game, we all need athletic quarterbacks. Every coach is looking for mobility. It's just not a black-white thing anymore." That means more Steve McNairs, Donovan McNabbs, Daunte Culpeppers -- and Jay Fiedlers (Miami's white Jewish quarterback). Overall, the pool of such quarterbacks is overrepresented among blacks, but only blacks of West African ancestry.

We may not be in a golden age of race relations in sports, but there is every reason to believe that racism is less and less a factor in who plays and flourishes at what position in football -- even as race remains important. On average, different populations have different anatomies. Continued white domination of the offensive line reflects the bio-mechanical reality that whites have the musculature for more potential upper-body strength. That's not to say it's true that blacks are fast and whites are strong: Kenyans and other East Africans are neither blazingly fast nor meaty and strong, but are great distance runners as a result of their ectomorphic bodies.

With racism on the wane, African-Americans are getting more opportunities because the people making decisions in the NFL have changed, the way the media talks about black quarterbacks has changed and the position itself requires more athleticism. And more than anything else, sports is a business. The bottom line is performance.

Success in sports is best understood as a biocultural phenomenon. Think of genes as the foundation of a house; culture and the environment are the furniture that give a home character and individuality. But while biological differences stretched across an entire population may help explain the trends in who is more likely to become a sprinter, wide receiver or mobile quarterback, they say little about the success of any individual athlete. While potential is 100 percent genetic, individual accomplishment mostly reflects drive, courage and luck.

Still, this remains a taboo subject, as the tone of recent articles on black quarterbacks underscores. That won't change until we as a culture are more willing to openly discuss the social and genetic factors that shape human diversity. That may be a long time coming. A few years ago, I was attending a sports sociology conference discussion on this very subject, racial profiling in football. Despite voluminous evidence that the practice had all but disappeared, most of the academicians were loath to abandon what had been a fundamental belief in sports sociology for three decades.

In the midst of this insular discussion, a massive black hand shot up from the rear. Sitting by himself was a man the size of a defensive lineman. "I've been listening to this nonsense going on half an hour," he said. "I've been a coach at Ohio State, and I can tell you that there is no way we would let stacking go on. This is just bull. At Division I or in the pros, to survive coaches have to recruit the best players and we damn well better play them at the optimal positions. We don't care if a player is white, black or striped. The pressure to win is immense. If we don't, we will be out on our ass."

The audience, evenly split between blacks and whites, was startled by the even-voiced vehemence of this massive black presence. It says something of the subject's explosiveness that the one-time Ohio State assistant asked not to be identified.

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