The team carried out a preliminary genetic analysis of the backcross mice, and showed that the propensity to dig long burrows is actually due to changes in three genetic regions, with a fourth region controlling the escape route behaviour.

BBC: Mouse burrowing 'in their genes'

Genetic analysis led by a team at Sweden's Uppsala University found that the woman closely resembled modern-day Southern Europeans and had many genetic differences from three hunter-gatherers living at the same time in Sweden and buried nearby.

WSJ: Migrations Spurred Agriculture Spread, Studies Indicate

The result, when combined with new techniques of genetic analysis, has been a revolution in the understanding of humanity's past.

ECONOMIST: The proper study of mankind

Genetic testing involves an analysis of a DNA sample.

BBC: Experts urge genetic test controls

To avoid that issue, Dr. Muller envisions the technology as part of a strategy in which people would first be identified as at risk through a genetic test and a noninvasive imaging test such as a CT scan before being referred for the spectroscopy analysis.

WSJ: Predicting Who Will Have Heart Attacks

The power of this type of genetic analysis was demonstrated earlier this year when a study of 2, 000 breast cancers showed the cancer should be thought of as 10 completely separate diseases.

BBC: DNA mapping for cancer patients

It was more common for identical twins to both have Alzheimer's compared to non-identical, and a statistical analysis of risk rates in the groups gave the researchers their estimate of how significant genetic factors are.

BBC: NEWS | Health | Alzheimer's risk 'is 80% genetic'

Their analysis showed that bad behaviour without psychopathy has relatively little genetic component less than a third.

ECONOMIST: Evidence that psychopaths are born, not made