About My Health Careers Internship MedBlogs Contact us
Medindia LOGIN REGISTER

New Vertebrate Species Formed Due To Sex Chromosome Evolution

by Aruna on September 30, 2009 at 12:37 PM
Font : A-A+

New Vertebrate Species Formed Due To Sex Chromosome Evolution

Studies say experiments in stickleback fish have shown for the first time that the evolution of new sex chromosomes is the driving force behind the formation of a new vertebrate species.

Up until now, most evidence has shown that new species arise because they have adapted to new environments.


But, according to a report in Nature News, scientists found that the emergence of new sex chromosomes caused a population of threespine stickleback fish in the Japan Sea, to diverge from its Pacific Ocean-dwelling ancestor (Gasterosteus aculeatus) - creating a new species.

Jun Kitano, an evolutionary biologist at Tohoku University in Japan, and his team discovered that the Japan Sea stickleback fish had different sex chromosomes compared to their ancestors.

The ancestral Y sex chromosome (which makes males) had fused with a non-sex chromosome to create a new sex chromosome in the Japan Sea stickleback fish.

The team also observed that the Japan Sea males exhibited more aggressive mating behaviors than their ancestral populations.

Females from the ancestral population avoid mating with the Japan Sea fish due to their more aggressive behaviour. And in lab tests, the male progeny of the two populations were sterile.

The study found that the gene responsible for the aggressive mating behavior of the Japan sea males was on the new Y chromosome.

The new mating behaviors linked to the new sex chromosome stop the two populations from mating, making the Japan Sea population a new species.

"There is a gene on the new sex chromosome that causes differences in mating behavior in the male stickleback. This behavior leads to evolution of a new species of stickleback," said Catherine Peichel, a molecular biologist at the Fred Hutchinson Cancer Research Center in Seattle, Washington, and a member of the research team.

According to Ole Seehausen, a fish ecologist and evolutionist at the Swiss Federal Institute of Aquatic Science and Technology in Dubendorf, the study is "remarkable".

"This is the first study that has shown a direct link between the evolution of sex chromosomes in vertebrates and the evolution of a new species," he said.

Source: ANI
ARU

News A-Z
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
News Category
What's New on Medindia
First-Ever Successful Pig-To-Human Kidney Transplantation
World Osteoporosis Day 2021 -
Spirituality and Mental Health
View all

Medindia Newsletters Subscribe to our Free Newsletters!
Terms & Conditions and Privacy Policy.

More News on:
Birth Defect - Genetic Metabolic Defects Sex Facts Prostitution: Fresh Stakes in the Oldest Trade Sexual Intercourse Facts Safe Sex Top Ten Trivial Sex Facts Top Ten Sex Tips for Men Sex Numbers Fahrīs Syndrome 

Recommended Reading
Fish and Humans Share the Same Skin Colour Secrets
Despite a huge evolutionary gulf between humans and the three-spined stickleback fish, both species ...
Female Promiscuity in Fish Leads to Bigger and Faster Sperm
Female promiscuity in fish leads to bigger and faster sperm, says an Australian researcher....
Jellyfish Explosion Dangerous To Ocean Ecosystem
Overfishing and global warming could be leading to an explosion of jellyfish, and such a ......
Birth Defect - Genetic
Achondroplasia is a genetic disorder which is one of the leading causes of dwarfism ...
Fahrīs Syndrome
Fahr''s syndrome is a rare, neurological disorder first described by Karl Theodor Fahr, a German neu...
Metabolic Defects
Metabolism is the sum total of all chemical and physical changes that take place in any organism tha...
Prostitution: Fresh Stakes in the Oldest Trade
Prostitution has broadened its base to include street prostitution, massage brothels, gigolo outcall...
Safe Sex
Sex is fun but involves health risks such as sexually transmitted diseases (STDs or unplanned pregna...

Disclaimer - All information and content on this site are for information and educational purposes only. The information should not be used for either diagnosis or treatment or both for any health related problem or disease. Always seek the advice of a qualified physician for medical diagnosis and treatment. Full Disclaimer

© All Rights Reserved 1997 - 2021

This site uses cookies to deliver our services. By using our site, you acknowledge that you have read and understand our Cookie Policy, Privacy Policy, and our Terms of Use