1.   And they should enable medical geneticists to trace elusive links between genes and disease, particularly the common diseases to which many genes contribute.

2.   Dr. Barbara Weber, who is a medical geneticist at the University of Pennsylvania, also stores DNA for research purposes.

3.   Peter Harper, a medical geneticist at the University of Wales at Cardiff, argues that insurance companies should keep the uncertainty that underpins insurance.

4.   The medical geneticist is the specialist who counsels in such circumstances.

5.   This is true of small or once-small populations such as Ashkenazis, Finns and Icelanders, who for that reason are much studied by medical geneticists.