11.   I suspect that other single gene disorders, such as cystic fibrosis and haemophilia B, will follow relatively quickly, certainly by the end of the decade.

12.   This susceptibility is not caused by a single gene defect but is thought to result from the cumulative interaction of a number of genes.

13.   There is indeed a single gene male which has recently been and it acts as a switch.

14.   Other facts, however, such as a much lower than expected rate in more distant relatives, make a single gene theory seem unlikely.

15.   But by comparing the bodies of two adult animals that are known to differ according to a single gene, they can see what effects that single gene has.

16.   Because of such complications, behavioral genetics is moving from OGOD to the idea that no single gene is sufficient for a complex trait.

17.   Because the lineage is based on a single mitochondrial gene, it is too early to know exactly what happened.

18.   A single gene would be easier to trace than a combination and would make a better starting point for research, Dr. Christiano said.

19.   A single gene, researchers have found, seems to be behind the disease.

20.   Adult height depends mostly on a single gene, say researchers in the United States.