Free Newsletter
Register for our Free Newsletters
Newsletter
Zones
Advanced Composites
LeftNav
Aerospace
LeftNav
Amorphous Metal Structures
LeftNav
Analysis and Simulation
LeftNav
Asbestos and Substitutes
LeftNav
Associations, Research Organisations and Universities
LeftNav
Automation Equipment
LeftNav
Automotive
LeftNav
Biomaterials
LeftNav
Building Materials
LeftNav
Bulk Handling and Storage
LeftNav
CFCs and Substitutes
LeftNav
Company
LeftNav
Components
LeftNav
Consultancy
LeftNav
View All
Other Carouselweb publications
Carousel Web
Defense File
New Materials
Pro Health Zone
Pro Manufacturing Zone
Pro Security Zone
Web Lec
Pro Engineering Zone
 
 
 
News

Males' DNA propels evolution, study says

University Of Chicago : 11 April, 2003  (Technical Article)
In the battle between the sexes, there's one area where males dominate females, they have a higher rate of genetic mutation, driving the evolution of the species, according to research published Thursday.
The finding could help settle a debate among scientists that challenges the prevailing theory of what pushes evolutionary change in humans.

'Mutation is the ultimate source of variation,' said Wen-Hsiung Li, a University of Chicago evolutionary geneticist. 'Your ancestors and my ancestors accumulated different mutations, which is part of the reason why you and I look different.'

It is also the reason why humans and chimpanzees diverged from a common ancestor between 5 million and 6 million years ago, he said. Mutations occur at a random rate and can be either beneficial or harmful to an organism.

Li and co-investigator Kateryna Makova report in the British science journal Nature that the mutation rate of human, chimp, gorilla and gibbon males is five to six times greater than their female counterparts.

Evolutionists believed for more than half a century that the high male mutation rate was the driving force of evolutionary change because sperm stem cells are constantly dividing to produce sperm.

When cells divide, there is a greater chance that an error could be made in copying DNA, which produces a genetic mutation. A female is born with all of the eggs she will have in life, and they do not divide, reducing the chance of genetic alteration.

This mechanism of evolution was recently challenged by studies at the Whitehead Institute and the International Human Genome Sequence Consortium, which reported that the male mutation rate was less than twice that of females.

The findings left evolutionists in a quandary because the rate of genetic mutation was too small to make a difference in evolutionary change.

Makova said the U. of C. study 'is independent proof of the dominant male in producing mutations for molecular evolution.'

The Chicago researchers determined the mutation rate by measuring genetic changes in the Y chromosome, which only males have, and a nonfunctional segment on chromosome 3, half of which comes from the mother and half from the father.

Since the Y chromosome is constantly being made in sperm during cell division, it has a greater chance of undergoing genetic errors, Li said. Half of the chromosome 3 segment comes from the nondividing eggs of the female and is less vulnerable to having genetic errors incorporated in its DNA.
Bookmark and Share
 
Home I Editor's Blog I News by Zone I News by Date I News by Category I Special Reports I Directory I Events I Advertise I Submit Your News I About Us I Guides
 
   © 2012 NewMaterials.com
Netgains Logo