Navigation Links
Men shed light on the mystery of human longevity, study finds
Date:9/13/2007

s, all women and most men in the six groups stopped having children by their 50s, the researchers found. But some men, particularly high-status males, continued to reproduce into their 70s. The paper noted that the age gap is most pronounced in societies that favor polygyny, where a man takes several wives, and in gerontocracies, where older men monopolize access to reproductive women. The authors also cite genetic and anthropological evidence that early humans were probably polygynous as well.

Older male fertility also exists in societies supporting serial monogamy, because men are more likely to remarry than women. "For these reasons, we argue that realized male fertility was substantial at ages well past female menopause for much of human history and the result is reflected in the mortality patterns of modern populations," the authors say. "We conclude that deleterious mutations acting after the age of female menopause are selected against ... solely as a result of the matings between older males and younger females."

According to Puleston, the "grandmother hypothesis" may be true, but the real pattern of male fertility extends beyond this explanation. "The key question is: Does the population have a greater growth rate if men are reproducing at a later age" The answer is 'yes.' The age of last reproduction gets pushed into the 60s and 70s if you add men to the analysis. Hamilton's approach was right, but in a species where males and females have different reproductive patterns, you need a two-sex model. You can't correctly estimate the force of selection if you leave men out of the picture. As a man myself, it's gratifying to know that men do matter."


'/>"/>

Contact: Lisa Trei
lisatrei@stanford.edu
650-725-0224
Stanford University
Source:Eurekalert

Page: 1 2 3 4

Related biology news :

1. Researchers discover way to make cells in the eye sensitive to light
2. Recent breakthroughs in common adult leukemia highlighted in New England Journal of Medicine
3. Bacteria collection sheds light on urinary tract infections
4. Sea skate experiment sheds light on human cell transport
5. X-Ray Beams And Fruit Fly Flight Simulator Aid Scientists View Of Muscle Power
6. McGill researchers shed light on formation of carcinogen in food
7. Scientists discover how plants disarm the toxic effects of excessive sunlight
8. Light therapy may combat fungal infections, new evidence suggests
9. Medical molecules designed to respond to visible light that can penetrate tissue
10. Genetic defects give the immune system the green light to attack the pancreas
11. Researchers find gene that may be at root of potato blight
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:7/11/2014)... Shenzhen, July 10, 2014---A team of researchers from The ... have identified a gene of wild soybean linked to ... to grow in saline soil. This study published online ... to unveil novel genomic information for crop improvement. , ... to domestication and human selection, cultivated soybeans have less ...
(Date:7/11/2014)... Researchers have pioneered a revolutionary new way ... called Virtual Finger, allows scientists to move through ... synapses using the flat surface of their computer ... studies orders of magnitude more efficient, saving time, ... many areas of experimental biology. The software and ...
(Date:7/11/2014)... Evidence exists that cannabinoid receptor type 1 ... Ca2+ influx, and reduce neurotransmitter release. However, ... 1 can increase extracellular Ca2+ influx and ... his team, Tongji Hospital Affiliated to Tongji ... Technology, China used whole cell voltage-clamp and ...
Breaking Biology News(10 mins):BGI reports a novel gene for salt tolerance found in wild soybean 2Virtual finger enables scientists to navigate and analyze complex 3D images 2
... Of Southern California School Of Dentistry have uncovered another clue ... leads to palate formation. Cleft palate is one ... out of every 700 live births. Clefts are more common ... males are twice as likely to have a cleft lip, ...
... record biometric revenues and profitability, WALL, N.J., ... BKYI), a leader in wireless public safety and,finger-based ... and strong revenue growth for its second quarter,ended ... operations for the quarter ended June 30,2008 was ...
... As people age, their cells become less efficient at ... of toxic material that is especially pronounced in Alzheimer,s, Parkinson,s ... first time, scientists at the Albert Einstein College of Medicine ... entire organ the liver and shown that, as ...
Cached Biology News:USC researchers identify alternate pathway that leads to palate development 2USC researchers identify alternate pathway that leads to palate development 3BIO-key(R) Reports Profitability on Strong Revenue Growth for Second Quarter 2008 2BIO-key(R) Reports Profitability on Strong Revenue Growth for Second Quarter 2008 3BIO-key(R) Reports Profitability on Strong Revenue Growth for Second Quarter 2008 4BIO-key(R) Reports Profitability on Strong Revenue Growth for Second Quarter 2008 5In scientific first, Einstein researchers correct decline in organ function associated with old age 2In scientific first, Einstein researchers correct decline in organ function associated with old age 3
(Date:7/11/2014)... Research and Markets  has announced the ... Global Industry Analysis, Size, Share, Growth, Trends and Forecast ... http://photos.prnewswire.com/prnh/20130307/600769 Transfection is ... or RNA) into cells. This technology helps the cells ... protein metabolism by affecting the nuclear genes. The transfection ...
(Date:7/11/2014)... July 11, 2014 Cayenne Medical, ... specializing in the soft tissue reconstruction segment, announced ... System for surgeries involving the shoulder and extremities. ... a novel, inserter-controlled deployment method. The unique delivery ... deployment, anchor pull-out, or anchor displacement (also commonly ...
(Date:7/10/2014)... Terascala, the industry leader in ... a former vice president of product management for Flexera ... of marketing. Terascala’s software when combined with leading compute ... highest performance and most reliable solutions for processing big ... channel expansion and broaden its product portfolio. His leadership ...
(Date:7/10/2014)... July 10, 2014 Senior supply chain ... professional associations, addressed the challenges of “Reducing Cost, Lead ... Industries” through strategic sourcing. Describing the partnership of the ... Supply Chain Management Institute ( SCMI) of the ... June 24 at the Kroc Institute of Peace and ...
Breaking Biology Technology:International Transfection Technology Market - Industry Analysis, Size, Share, Growth, Trends and Forecast to 2019 2Cayenne Medical Launches SureLock™ All-Suture Anchor System for Shoulder and Extremity Surgery 2Cayenne Medical Launches SureLock™ All-Suture Anchor System for Shoulder and Extremity Surgery 3Terascala Expands Executive Team 2Terascala Expands Executive Team 3Biotech & Biopharm Supply Chain Management Executives Launch BSMA in San Diego 2Biotech & Biopharm Supply Chain Management Executives Launch BSMA in San Diego 3Biotech & Biopharm Supply Chain Management Executives Launch BSMA in San Diego 4
... Fla., April 9 Cryo-Cell International, Inc. ... world,s largest and most established family cord blood banks, ... 28, 2009. Consolidated revenues for the first quarter ... approximately $4.2 million for the first quarter of fiscal ...
... the release of it,s advanced nutritional supplement, Caplex, ... a unique patent pending formulation created by ... provides cancer patients a comprehensive source of the ... on results accumulated from medical research. Impressive changes ...
... NANTONG, China, April 8 Sinobiopharma Pharmaceutical Group ... the appointment of Ms. Yan Tan as Director ... Co., Ltd., Netherlands. She served as a China-based ... sold to Schering-Plough. Prior to Organon, Ms. Tan ...
Cached Biology Technology:Cryo-Cell International, Inc. Reports First Quarter 2009 Results 2Cryo-Cell International, Inc. Reports First Quarter 2009 Results 3Cryo-Cell International, Inc. Reports First Quarter 2009 Results 4Cancer Fighting Nutrition Supplement, Caplex, Offers Cancer Patients A New All-Natural Treatment Option 2Sinobiopharma, Inc. Appoints New Director of Marketing 2
Request Info...
Request Info...
Epi-Grids™ Colony Grid Templates are easy-to-use griding templates that allow rapid organization of colonies from initial screening plates and for preparing precise master plates....
Competitors to lower non-specific signal...
Biology Products: