Beginning of Essay
About 1 out of 201 Caucasian people carries at least one of the fatal defective genes that cause , CF, or mucoviscidosis (in Europe) although carriers don't show any signs of the disease. Therefore, 10 million people carry the defective gene and aren't aware of it ....

Middle of Essay
.... salty tasting skin, constant coughing, large amounts of mucus, trouble gaining weight, frequent greasy, foul smelling bowel, growths in the nose (nasal polyps) and clubbed or enlarged fingertips and toe tips is another symptom. Now there are many tests that can be done to find out if a person has CF. Doctors can now do genetic testing for CF, but about 10 years ago they couldn't. In 1989, the location where the of the defective gene on chromosome number 7 is was discovered by Francis S. Collins from University of Michigan. Tests can now be taken to see if an unborn child is infected with CF such tests are amniocentesis, chronic villus biopsy ....