31.   Few processes or disorders in the body are the result of a single gene malfunctioning, Hood said.

32.   Experiments in mice have revealed that mutations in a single gene, Hox, affected the development not only of digits but of ovaries and testes as well.

33.   Experts say they do not believe that this or any other single gene is solely responsible for the aging process.

34.   For one thing, such illnesses probably stem not from single genes.

35.   Genetic tests already can detect rare but serious disorders in infants and can find single malfunctioning genes that cause diseases such as Duchenne muscular dystrophy and cystic fibrosis.

36.   Hamer said that, because there is no single gene determining homosexuality, he is not worried about the possible use of genetic testing to persecute gays.

37.   Hidden somewhere in the cancer cells sloshing in the hot, red nutrient bath in this Florida Atlantic University lab is a single gene that could save your life.

38.   His own computer simulations, he added, predicted the existence of stable meta-cell components that held as few as a single gene.

39.   If each condition were caused by a single gene, then surely that gene could somehow be removed or switched off, curing the illness.

40.   If all human traits stem from single genes, then how could the encyclopedic differences between humans and roundworms be explained by so few genes?