Navigation Links
Genetic conflict in fish led to evolution of new sex chromosomes
Date:10/1/2009

University of Maryland biologists have genetically mapped the sex chromosomes of several species of cichlid (pronounced "sick-lid") fish from Lake Malawi, East Africa, and identified a mechanism by which new sex chromosomes may evolve. In research published in the journal Science (October 1, 2009), Professor Thomas D. Kocher, Department of Biology, College of Chemical and Life Sciences; Reade Roberts, post-doctoral associate; and Jennifer Ser, research associate, describe the genetic basis for two co-existing systems of sexual determination in cichlid fish from Lake Malawi.

In nearly all mammals, the gene that determines the sex of offspring is located on the Y chromosome, which is much smaller than the X chromosome. But in many other animal groups, the genetic mechanism of sex determination evolves quite rapidly, and the differences between sex chromosomes are harder to observe. Even sister species of fish may have entirely different sex determination systems. How and why the genetic mechanisms for such an ancient developmental distinction continue to evolve has remained a mystery. The thousands of closely related cichlid fishes in the lakes of East Africa turn out to be an excellent model system for understanding how the mechanisms of how sex determination evolve.

The East African cichlid fishes that inhabit Lakes Malawi, Tanganyika, and Victoria are known for their sexually distinct appearance the males are generally conspicuous and brightly colored, making them more attractive to females, while the females are drab and brown, making them inconspicuous to predators. One exception to the uniformly brown pigmentation among female cichlids is the "orange blotch" pattern, which appears in some female cichlids that live in rocky areas of Lake Malawi. "We believe that the orange blotch color pattern emerged as a new mutation in females and has a selective advantage in providing an alternative form of camouflage," says Dr. Kocher, who ha
'/>"/>

Contact: Kelly Blake
kellyb@umd.edu
301-405-8203
University of Maryland
Source:Eurekalert  

Page: 1 2

Related biology news :

1. Does the desire to consume alcohol and tobacco come from our genetic makeup?
2. Diverse genetic abnormalities lead to NF-κB activation in multiple myeloma
3. Many parents at-risk for cancer disclose genetic test results to children
4. Genetics determine optimal drug dose of common anticoagulant
5. Claims of sex-related differences in genetic association studies often not properly validated
6. American College of Medical Genetics responds to new FDA labeling decision for warfarin
7. UNC study questions FDA genetic-screening guidelines for cancer drug
8. Genome study shines light on genetic link to height
9. Selexis Announces Advanced Approach to Maximize Power of Genetic Elements for Rapid Development of High Performance Cell Lines
10. Genes, Environment and Health Initiative invests in genetic studies, environmental monitoring
11. Rutgers Genetics receives $7.8 million for autism research
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Genetic conflict in fish led to evolution of new sex chromosomes
(Date:7/10/2014)... 27, 2014  The American Academy of Forensic ... Standards and Technology (NIST) and the Department of ... and forensic science expert members to the Forensic ... element of the NIST,s Organization of Scientific Area ... first appointments made to the new FSSB that ...
(Date:7/10/2014)... 1, 2014 Smart technology emphasis grows ... and improved security: NXT-ID, Inc. (OTCBB: NXTD), eBay Inc. (NASDAQ: ... ), Apple Inc. (NASDAQ: AAPL ), Visa Inc. ... NXT-ID, Inc., (OTCQB: NXTD) a biometric authentication company focused ... the second series of 30 second spots on CNBC for ...
(Date:7/10/2014)... July 2, 2014 NXT-ID, Inc., (OTCQB: NXTD) a biometric authentication ... Mr. Gino Pereira was interviewed on July 1 ... Tampa Florida . Mr. Pereira discusses the company,s ... Harris and how the Wocket™ aims to replace a ... Cedric Harris tells Gino he has never ...
Breaking Biology News(10 mins):Ten Members of the American Academy of Forensic Sciences Appointed to Forensic Science Standards Board (FSSB) 2Ten Members of the American Academy of Forensic Sciences Appointed to Forensic Science Standards Board (FSSB) 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 5Security and Your Money: Tampa Bay Radio Host Cedric Harris Talks to NXT-ID CEO Mr. Gino Pereira about the Wocket Smart Wallet 2Security and Your Money: Tampa Bay Radio Host Cedric Harris Talks to NXT-ID CEO Mr. Gino Pereira about the Wocket Smart Wallet 3Security and Your Money: Tampa Bay Radio Host Cedric Harris Talks to NXT-ID CEO Mr. Gino Pereira about the Wocket Smart Wallet 4
... years for marine invertebrates living on the Port Valdez ... according to a scientist at the University of Alaska ... Richter scale, and the tsunami waves that followed, impacted ... Blanchard, a research assistant professor at the UAF School ...
... pig population continues to expand, increasing the potential for interaction ... Researchers at North Carolina State University examined feral pigs from ... can be transmitted from animals to people Toxoplasma ... study found that wild pigs host a significant number of ...
... their collaborators have detected the antimatter partner of the ... heaviest antimatter particle ever detected. Scientists at ... detector that identified antihelium-4. The $7.5 million detector was ... Chinese scientists contributing $2.5 million to the project. The ...
Cached Biology News:Port Valdez invertebrates stabilized 26 years after quake 2Wild hogs: Researchers examine impact of feral pigs in eastern N.C. 2Rice-born detector finds heaviest antimatter 2Rice-born detector finds heaviest antimatter 3
(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:7/10/2014)... 2014 Understanding the need for better ... and the gap that currently exists in this area, ... industry-leading portfolio of validated ion channel and GPCR cell ... lines, as ion channels control many critical physiological functions ... creates the potential to treat a variety of human ...
(Date:7/10/2014)... EvoDerma ’s NOOME Anti-Aging Motion has been ... comes with a second treatment cup to help prevent and ... cup is thinner on the edges for a softer contact ... and uneven surfaces on the face, neck and décolleté. Choose ... on areas such as the cheeks and neck, or opt ...
(Date:7/10/2014)... PROVO, Utah , July 10, 2014 ... genome annotation and interpretation, today announced an ... sequencing (NGS) analytics for Lineagen,s NextStep Dx ... evaluation of neurodevelopmental and neurological disorders, currently ... chromosomal microarray (CMA) testing service used by ...
Breaking Biology Technology:Virtual Finger Enables Scientists To Navigate And Analyze 3D Images Of Complex Biological Structures 2Virtual Finger Enables Scientists To Navigate And Analyze 3D Images Of Complex Biological Structures 3Leader in Ion Channel Research Announces Newly Validated and Re-Engineered Cells 2Leader in Ion Channel Research Announces Newly Validated and Re-Engineered Cells 3Introducing a New Bonus Treatment Cup for EvoDerma’s NOOME Anti-Aging Motion 2Tute Genomics Platform Selected to Provide Clinical Interpretation for Lineagen's NextStepDx PLUS Next-Generation Sequencing-Based Diagnostic Test 2Tute Genomics Platform Selected to Provide Clinical Interpretation for Lineagen's NextStepDx PLUS Next-Generation Sequencing-Based Diagnostic Test 3Tute Genomics Platform Selected to Provide Clinical Interpretation for Lineagen's NextStepDx PLUS Next-Generation Sequencing-Based Diagnostic Test 4
... Devgen,(Eurolist: DEVG) and Monsanto Company (NYSE: MON ... which Monsanto has agreed, subject to certain,customary conditions, to ... 18 million (25 million $) and representing 5.9%,of the ... take place,no later than November 2007. It is ...
... announces today,that a service agreement with Roche Diagnostics ... its automated immunohistochemistry,service platform for analyzing various biomarkers ... will provide for this project a selection of,tumor ... as specifically,collected clinical samples. The analysis of specific ...
... Nationally, SCOTTSDALE, Ariz., Sept. 14 CHS, an ... by the U.S. Department,of Defense as a recipient of ... award, sponsored by the National Committee of Employer,Support of ... honor,bestowed upon America,s employers who provide support to their ...
Cached Biology Technology:Monsanto Company Signs Share Subscription Agreement With Devgen 2Monsanto Company Signs Share Subscription Agreement With Devgen 3CHS Receives Prestigious Honor from Department of Defense 2CHS Receives Prestigious Honor from Department of Defense 3
... This kit allows for rapid, convenient, and ... simple bind/wash/elute process utilizes a spin column ... beads for concentration of proteins which were ... are strong ion exchangers, offering high binding ...
... angle system, 220-240 V, is used to resolve ... fragments by pulsed field gel electrophoresis (PFGE). The ... pump, 14 x 13 cm casting stand with ... thick comb, screened cap, disposable plug molds, 12 ...
... kit is designed to knockout or alter genes ... than one week. Red/ET recombination allows the exchange ... specific, and faithful manner. An FRT-flanked kanamycin resistance ... can be used to replace a gene on ...
... separation system using the asymmetric flow Field ... easily with Wyatts multi-angle light scattering (MALS) ... the Optilab DSP. The combined system provides ... the particles/molecules separated by the AFFF unit. ...
Biology Products: