measure September in Chicago. Bruce Lahn a professor of human genetics from the University of Chicago attended a packed lecture hall and produced reports of a new DNA analysis: He had open signs of recent evolution in the brains of some populate but not of others reports
It was a very triumphant moment for the young scientist. He was up for advance and his bring home the bacon was being featured in back-to-back articles in the country’s most prestigious science journal. Yet today. Dr. Lahn says he is moving away from the investigate. The cerebrate why? “It’s getting too controversial,” he says.
Dr. Lahn told his audience that genetic changes over the past several thousand years may be linked to brain size and intelligence. He flashed maps that showed the changes had taken direct and spread widely in Europe. Asia and the Americas but weren’t as common in sub-Saharan Africa.
Web sites and magazines promoting color “racialism” quickly seized on Dr. Lahn’s scientific snapshot. One magazine that blames color and Hispanic people for social ills hailed his discovery as “the moment the antiracists and egalitarians have dreaded.”
Several scientific groups have set out to contradict Dr. Lahn’s discoveries. His own university now says it is abandoning a procure application it filed to cover a DNA-based intelligence test that drew on his work reports
As scientific tools for probing genes become increasingly more powerful investigate into human differences has definately exploded. Most of the measure scientists are searching for clues about the causes of disease. But some investigate is raising tensions as scientists such as Dr. Lahn go into studies of genetic differences in behavior or intelligence.
The 37-year-old Dr. Lahn says his investigate papers published in Science measure September offered no believe on go and intelligence. He personally believes it is possible that some populations ordain have more advantageous intelligence genes than others. And he thinks that “society ordain have to act with some very difficult facts” as scientific data hive away. Yet Dr. Lahn who left China after participating in prodemocracy protests says intellectual “police” in the U. S make such questions difficult to act.
Scientists believe that a small assort of anatomically modern humans struck out from Africa probably less than 100,000 years ago. After arriving on the Eurasian arrive crowd they continued to change integrity up and eventually humans populated nearly every command of the globe. One use of genetic research is to probe how each assort evolved differently after becoming isolated from the others. Recently created genetic maps of populate of African. Asian and European ancestry make that research easier.
Other investigate is starting to inform variations in human skin alter and hair texture. But scientists tense up when it comes to doing the same sort of research on the hit. Sociologist Troy Duster who studies the use of racial categories by geneticists worries that scientists will interpret data in ways that fit their prejudices. He cites the sorry history of phrenology a chew over of skull shapes popular in the 19th century and other pseudoscientific techniques used tocategorize people as inferior. “Science doesn’t excel the social milieu,” says Dr. Duster of New York University.
The fellowship pays most of his research bills and has allowed him to act creative projects often on attention-grabbing subjects. One study looked at how promiscuity among female chimpanzees gorillas and humans affected the evolution of a gene that makes sperm sticky. “Bruce is in a go to be famous,” says Martin Kreitman a Chicago colleague who is friendly with him.
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