Japanese  
  Home  |  Top News  |  Most Popular  |  Video  |  Multimedia  |  News Feeds  |  Feedback
  Medicine  |  Nature & Earth  |  Biology  |  Technology & Engineering  |  Space & Planetary  |  Psychology  |  Physics & Chemistry  |  Economics  |  Archaeology
Top > Biology >
Grandmas Made Humans Live Longer

Published: October 24, 2012.
By University of Utah
http://www.unews.utah.edu/

Summary

SALT LAKE CITY, Oct. 24, 2012 – Computer simulations provide new mathematical support for the "grandmother hypothesis" – a famous theory that humans evolved longer adult lifespans than apes because grandmothers helped feed their grandchildren.

The simulations indicate that with only a little bit of grandmothering – and without any assumptions about human brain size – animals with chimpanzee lifespans evolve in less than 60,000 years so they have a human lifespan.

The findings showed that from the time adulthood is reached, the simulated creatures lived another 25 years like chimps, yet after 24,000 to 60,000 years of grandmothers caring for grandchildren, the creatures who reached adulthood lived another 49 years – as do human hunter-gatherers.

But it is possible that the benefits grandmothers provide to their grandchildren might be the result of long postmenopausal lifespans that evolved for other reasons, so the new study set out to determine if grandmothering alone could result in the evolution of ape-like life histories into long postmenopausal lifespans seen in humans.

The researchers were conservative, making the grandmother effect "weak" by assuming that a woman couldn't be a grandmother until age 45 or after age 75, that she couldn't care for a child until age 2, and that she could care only for one child and that it could be any child, not just her daughter's child.

The simulation begins with only 1 percent of women living to grandmother age and able to care for grandchildren, but by the end of the 24,000 to 60,000 simulated years, the results are similar to those seen in human hunter-gatherer populations: about 43 percent of adult women are grandmothers.

The new study found that from adulthood, additional years of life doubled from 25 years to 49 years over the simulated 24,000 to 60,000 years.


Read Full Story »

Keywords

Years, Human, Hawkes, Age, Adulthood, Grandmother, Grandmothering, Women, Grandchildren, Weaning, Utah, Males, Longevity, Live, Lifespans, Lifespan, Kids, Hypothesis, Hunting, Humans, Grandmothers, Couldn, Child, Apes, Size, Simulation, Reach, People, Means, Longer, Food, Females, Effect, Creatures, Collect, Chimps, Care, Brains, Brain, Bigger, Average, Ancestors, Adult, Window, Tubers, Time, Step, Simulations, Selection, Resources, …

Cluster Centroids (Superclass Keywords)

Oocytes, Cobo, Vitrification, Menstruation, Labs, Oocyte, Women, Sheltzer, Hawkes, Fresh, Pregnancy, Grandmother, Grandmothering, Faculty, Banking, On-Going, Female, Adulthood, Evil, Carrie, Embryos, Egg, Grandchildren, Babies, Grandmothers, Born, Method, Shower, Trial, Members, Gender, Groups, Age, Patients, Institutions, Top-Quality, Screen, Lifespans, Factor, Safer, Precludes, Postdocs, Couldn, Synchronise, Semen, …

Show articles in this group »


More news from University of Utah


Fecal Transplants Let Packrats Eat Poison
21 July 2014
New View of Rainier's Volcanic Plumbing
17 July 2014
New Plant Species from the Heart of Texas
09 July 2014
A Hotspot for Powerful Cosmic Rays
08 July 2014
Watching HIV Bud from Cells
16 May 2014
Nearest Bright 'Hypervelocity Star' Found
07 May 2014
Is Self-fumigation for the Birds?
05 May 2014
Related »

Oocyte 
6/30/10 
Ongoing Pregnancy Rates from Vitrified Eggs as Good as Those from Fresh
By European Society of Human Reproduction and Embryology
Rome, Italy: Embryos derived from oocytes (eggs) cryopreserved by the vitrification method are just as likely to produce an on-going pregnancy as those involving fresh oocytes, the 26th annual …
Vitrification 
6/29/10 
On-going Pregnancy Rates from Vitrified Eggs as Good as Those from Fresh
By European Society of Human Reproduction and Embryology (ESHRE)
Embryos derived from oocytes (eggs) cryopreserved by the vitrification method are just as likely to produce an on-going pregnancy as those involving fresh oocytes, the 26th annual meeting of …
Female 
6/30/14 
Research Reveals a Gender Gap in the Nation's Biology Labs
By Massachusetts Institute of Technology
CAMBRIDGE, MA -- Among the sciences, biology consistently attracts the greatest numbers of women to graduate school and academic careers. About half of all biology graduate students are women, …
Menstruation 
7/12/12 
Period Drama! Australian Research Criticizes Hollywood Portrayals of Menstruation
By University of Melbourne
An Australian study has criticized Hollywood's portrayal of menstruation, warning it's misinforming young girls and portraying periods as overly traumatic and humiliating. Researcher Dr Lauren Rosewarne, from the …
More » 
 
ScienceNewsline  |  About  |  Privacy Policy  |  Feedback  |  Mobile  |  Japanese Edition
The selection and placement of stories are determined automatically by a computer program. All contents are copyright of their owners except U.S. Government works. U.S. Government works are assumed to be in the public domain unless otherwise noted. Everything else copyright ScienceNewsline.