Grandma, not mum, knows best

Research at the University of Sheffield, published today in Nature, has solved the mystery of why women live so long after their reproductive years have ceased. Basically, grandmothers can ensure the success of their own family by helping to increase the reproductive success of their adult children, thus propagating their own genes.

Dr. Virpi Lummaa and her PhD student Mirkka lahdenperä, from the University of Sheffield and Turku in Finland, examined the family histories of women in Finland and Canada during the 18th and 19th centuries to determine why humans, unlike other animals, survive long after they are unable to reproduce. In the animal kingdom it is usual for both males and females to continue their reproductive life until they die.

The team found that the longer a woman lived after the end of her reproductive years, the more successfully her children’s reproductive lives would be. These children tended to begin their families earlier, have a shorter gap between children, have a longer reproductive life and produce offspring that were more likely to survive into adulthood. The effect was equal for both sons and daughters.

The team examined the lives of almost three thousand women and took into account different ages, socio-economic status, and social and cultural differences between Finland and Canada. The link remained throughout.

Dr Lummaa explains, “We consistently found that women gained, on average, two extra grandchildren for every ten years that they lived past their reproductive life. In evolutionary terms this gives a huge benefit as it makes it more likely that women who survive long after stopping reproduction will forward more genes to the next generation. The evidence suggests that the effect is caused by the woman passing her childcare experience on to her offspring. She can also take on some of the responsibilities of childcare, making it more likely that her children will have more children more quickly.”

Media Contact

Lorna Branton alfa

More Information:

http://www.shef.ac.uk

All latest news from the category: Social Sciences

This area deals with the latest developments in the field of empirical and theoretical research as it relates to the structure and function of institutes and systems, their social interdependence and how such systems interact with individual behavior processes.

innovations-report offers informative reports and articles related to the social sciences field including demographic developments, family and career issues, geriatric research, conflict research, generational studies and criminology research.

Back to home

Comments (0)

Write a comment

Newest articles

First-of-its-kind study uses remote sensing to monitor plastic debris in rivers and lakes

Remote sensing creates a cost-effective solution to monitoring plastic pollution. A first-of-its-kind study from researchers at the University of Minnesota Twin Cities shows how remote sensing can help monitor and…

Laser-based artificial neuron mimics nerve cell functions at lightning speed

With a processing speed a billion times faster than nature, chip-based laser neuron could help advance AI tasks such as pattern recognition and sequence prediction. Researchers have developed a laser-based…

Optimising the processing of plastic waste

Just one look in the yellow bin reveals a colourful jumble of different types of plastic. However, the purer and more uniform plastic waste is, the easier it is to…