Navigation Links
How ancient whales lost their legs, got sleek and conquered the oceans

When ancient whales finally parted company with the last remnants of their legs about 35 million years ago, a relatively sudden genetic event may have crowned an eons-long shrinking process.

An international group of scientists led by Hans Thewissen, Ph.D., a professor of anatomy at Northeastern Ohio Universities College of Medicine, has used developmental data from contemporary spotted dolphins and fossils of ancient whales to try to pinpoint the genetic changes that could have caused whales, dolphins and porpoises to lose their hind limbs.

More than 50 million years ago the ancestors of whales and dolphins were four-footed land animals, not unlike large dogs. They became the sleek swimmers we recognize today during the next 15 million years, losing their hind limbs in a dramatic example of evolutionary change.

"We can see from fossils that whales clearly lived on land - they actually share a common ancestor with hippos, camels and deer," said team member Martin Cohn, Ph.D., a developmental biologist and associate professor with the UF departments of zoology and anatomy and cell biology and a member of the UF Genetics Institute. "Their transition to an aquatic lifestyle occurred long before they eliminated their hind limbs. During the transition, their limbs became smaller, but they kept the same number and arrangement of hind limb bones as their terrestrial ancestors."

In findings to be published this week in the Proceedings of the National Academy of Sciences, scientists say the gradual shrinkage of the whales' hind limbs over 15 million years was the result of slowly accumulated genetic changes that influenced the size of the limbs and that these changes happened sometime late in development, during the fetal period.

However, the actual loss of the hind limb occurred much further along in the evolutionary process, when a drastic change occurred to inactivate a gene essential for limb development. This gene - called Sonic he
'"/>

Source:University of Florida


Page: 1 2 3

Related biology news :

1. Researchers find missing genes of ancient organism
2. Family trees of ancient bacteria reveal evolutionary moves
3. Scientists find fossil proof of Egypts ancient climate
4. U-M team recovers ancient whale in Egyptian desert
5. Deep sea algae connect ancient climate, carbon dioxide and vegetation
6. Analysis of flower genes reveals the fate of an ancient gene duplication
7. World-first technology enables study of ancient bacteria
8. Did humans cause ecosystem collapse in ancient Australia?
9. MBL researchers probe how an ancient microbe thrives and evolves without sex
10. A salty tale: New bacterial genome sequenced from ancient salterns
11. UF scientists reveal ancient origin of vertebrate skeleton
Post Your Comments:
*Name:
*Comment:
*Email:
TAG: How ancient whales lost their legs got sleek and conquered the oceans

(Date:7/10/2014)... YORK , June 27, 2014  Pomerantz ... Provectus Biopharmaceuticals, Inc. ("Provectus" or the "Company")(NYSE-MKT: PVCT) ... filed in United States District Court, Middle District ... is on behalf of a class consisting of ... acquired Provectus securities between December 17, 2013 and ...
(Date:7/10/2014)... -- Smart technology emphasis grows in biometrics sector ... NXT-ID, Inc. (OTCBB: NXTD), eBay Inc. (NASDAQ: EBAY ... (NASDAQ: AAPL ), Visa Inc. (NYSE: ... (OTCQB: NXTD) a biometric authentication company focused on the growing ... of 30 second spots on CNBC for its next generation ...
(Date:7/10/2014)... COMMACK, N.Y. , July 2, 2014 ... Inc. (ABD) to announce the appointment of the world-renowned ... its Board of Directors. Dr. Ginsburg, with ... two facilities: NY Presbyterian Hospital and Good Samaritan Regional ... Breathing Pacemaker since the late 1980,s and is considered ...
Breaking Biology News(10 mins):SHAREHOLDER ALERT: Pomerantz Law Firm Announces the Filing of a Class Action against Provectus Biopharmaceuticals, Inc. and Certain Officers - PVCT 2SHAREHOLDER ALERT: Pomerantz Law Firm Announces the Filing of a Class Action against Provectus Biopharmaceuticals, Inc. and Certain Officers - PVCT 3Advantages for Digital Wallets Eliminate Need to Carry Credit Cards - Large Scale CNBC Ad Campaign for Latest Smart Wallet to Commence July 7th 2Advantages for Digital Wallets Eliminate Need to Carry Credit Cards - Large Scale CNBC Ad Campaign for Latest Smart Wallet to Commence July 7th 3Advantages for Digital Wallets Eliminate Need to Carry Credit Cards - Large Scale CNBC Ad Campaign for Latest Smart Wallet to Commence July 7th 4Advantages for Digital Wallets Eliminate Need to Carry Credit Cards - Large Scale CNBC Ad Campaign for Latest Smart Wallet to Commence July 7th 5Avery Biomedical Devices, Inc. announces the appointment of Mark E Ginsburg, M.D. to its Board of Directors 2
... FOR ADULTS WITH INTELLECTUAL DISABILITIES: AN OPPORTUNITY FOR ... involving adults with intellectual disabilities found that the ... a semi-weekly class for four weeks. ... mental retardation, have slightly higher rates of obesity, ...
... celebrate the 150th anniversary this month of the publication ... of Biological Sciences (AIBS) is publishing open access two ... into evolution. , The two articles are by Kevin ... T. Costa of Western Carolina University. Padian,s article, "Ten ...
... MI-based Law Enforcement Intelligent Devices, LLC (LEID) will be ... System(TM) (BACS) at the U.S. Department of Health and ... Bethesda, MD. The locker system will support the ... our nation,s medical research agency. The project is ...
Cached Biology News:Indiana U. at APHA: Studies about health education for people with ID, stability balls at work 2Indiana U. at APHA: Studies about health education for people with ID, stability balls at work 3
(Date:7/10/2014)... Faso (PRWEB) July 10, 2014 ... today have access to an additional family planning ... access to contraception at all levels of the ... lower-dose formulation of a widely used contraceptive—Pfizer’s Depo-Provera® ... , Burkina Faso is the first of four ...
(Date:7/10/2014)... Boston, Mass. (PRWEB) July 10, 2014 ... , today announced that Alan Swahn, a former vice ... Terascala’s executive team as vice president of marketing. Terascala’s ... from Dell and NetApp create the highest performance and ... has been appointed to guide Terascala’s channel expansion and ...
(Date:7/10/2014)... July 10, 2014 EvoDerma ’s NOOME ... This rejuvenating device now comes with a second treatment cup ... time. , The new cup is thinner on the edges ... to target rough, thin and uneven surfaces on the face, ... for a stimulating treatment on areas such as the cheeks ...
(Date:7/10/2014)... , July 10, 2014  Kainos Capital, a ... brands, today announced that it has acquired the Slim-Fast ... in the business. Terms of the transaction were not ... and meal replacement business that markets ready-to-drink shakes, powders, ... North America and in the ...
Breaking Biology Technology:Injectable Contraceptive Launched in Burkina Faso to Expand Choice and Address Unmet Need 2Injectable Contraceptive Launched in Burkina Faso to Expand Choice and Address Unmet Need 3Injectable Contraceptive Launched in Burkina Faso to Expand Choice and Address Unmet Need 4Injectable Contraceptive Launched in Burkina Faso to Expand Choice and Address Unmet Need 5Injectable Contraceptive Launched in Burkina Faso to Expand Choice and Address Unmet Need 6Terascala Expands Executive Team 2Terascala Expands Executive Team 3Introducing a New Bonus Treatment Cup for EvoDerma’s NOOME Anti-Aging Motion 2Kainos Capital Acquires Slim-Fast From Unilever 2
... Inc.,(Nasdaq: OSTE ), a leader in the ... today that the Food and Drug,Administration ("FDA") has ... Adapting the Company,s proprietary Plexur(R),Technology, Plexur M(TM) is ... gaps,of the skeletal system that are not intrinsic ...
... Yesterday Ventria,Bioscience received the Friends of ... Board. Ventria received the award for their ... for students,and teachers. Ventria has provided students ... biotechnology. In 2007, Ventria provided a,grant for ...
... Efforts coincide with National Sleep Awareness Week March 3-9, ... truth has come,out: America is feeling drowsy. According to ... often sleepy at work,drive drowsy, and lose interest in ... hours per day and another 4.5 hours per week ...
Cached Biology Technology:Osteotech Receives FDA Clearance for Plexur M(TM) Biocomposite 2Osteotech Receives FDA Clearance for Plexur M(TM) Biocomposite 3Ventria Receives Friends of Education Award From Geary County School District 2SleepQuest Raises Awareness of Sleep Disorders 2
... Lines ,High Quality, Functionally-Validated, Ion Channel Cell ... for having a critical role in nerve ... key function in pain, CNS and the ... been investigated in therapeutic areas, such as ...
Mouse monoclonal antibody raised against a partial recombinant ALPK3. NCBI Entrez Gene ID = ALPK3...
Mouse monoclonal antibody raised against a partial recombinant MYO7A. NCBI Entrez Gene ID = MYO7A...
... Cell Lines ,High Quality, Functionally-Validated, Ion Channel ... known for having a critical role in ... a key function in pain, CNS and ... have been investigated in therapeutic areas, such ...
Biology Products: