鞍山科技大学外语系贺青一.ppt

鞍山科技大学外语系贺青一.pptNew College English Book Two
鞍山科技大学外语系贺青一
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1
New College English
Unit Six Nature and Nurture
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2
New College English
Unit Six Nature and Nurture
Background Information
Genes that predict disease
I Cancer
II Aids
Language Points and Structure
Translation
Exercises
Further development
Date
3
New College English
Background Information
Since the early 1980s, scientists have revealed some 40 human genes involved in cancer. These genes are essential for normal growth, but can be subverted ( 搅乱) to cause a tumor ( 肿瘤 ).
Dr. Jorge Yunis of the University of Minnesota Medical School in Minneapolis has found that 70 percent of oncogenes, or cancer-causing genes, are located near
Date
4
New College English
Background Information
inherited weak points on chromosomes.(染色体) Varying from individual to individual, these fragile sites are particularly vulnerable (敏感的)to chemical carcinogens( 致癌物质), X rays and other cancer-inducing agents. Yunis and other investigators have found that petroleum-based products-notably pesticides and insecticides-damage specific sites on at least two of the 23 pairs of human chromosomes that carry genetic information. Similarly, tobacco, smoke tends to attack a part of another chromosome..
Cancer
Date
5
New College English
Background Information
AIDS
An estimated million Americans have come into contact with the AIDS virus but remain free of symptoms. British researchers have just learnt that vulnerability to the lethal ( 致死的 ) virus depends at least in part on genes. A group of doctors looked at six combinations of an inherited protein found on some human and animal cell surfaces. The researchers concluded that one of the protein combinations makes the people who carry it highly resistant to AIDS, while another makes them highly vulnerable. The other four combinations fall in between.
Date
6
New College English
Background Information
The work may shed light on why t