71.   They said they doubted a single gene was responsible, as Klar suggests.

72.   Until recently biologists have concentrated on understanding single genes by studying them in isolation.

73.   Very few ailments are caused by a single gene, NuTec President Peter Morrissey said.

74.   Unlike molecular biology, which can identify single genes, in quantitative genetics scientists use direct observation to examine traits that result from the interactions of many genes.

75.   When Berrettini repeated his experiment without quinine in the control bottle, he found that just a single gene that apparently makes mice love morphine, was determining behavior.

76.   Both diseases are caused by flaws in a single gene.

77.   But others caution it would be wrong to heap too many expectations onto the damaged version of a single gene.

78.   But Pandolfi said his team found in the mouse studies that a mutation of a single PTEN gene is enough to start a disease process.

79.   Genetic engineering involves splicing a single gene from one organism to another one that often is unrelated.

80.   Genetic engineering involves splicing a single gene from one organism to another.