HOME >> BIOLOGY >> NEWS
Parting genomes: UA biologists discover seeds of speciation

ern Mexican coastline. In the lab, researchers can coax successful conjugal visits between members of the two groups. But even under laboratory conditions hybrid crosses aren't always fruitful. D. mojavensis mothers typically produce healthy offspring after mating with D. arizonae males, but when D. arizonae females mate with D. mojavensis males, all of the resulting hybrid sons are sterile. This partial capacity for interbreeding, Reed says, suggests that these flies are on the verge of evolving to become completely separate species.

Another finding adds support to that notion. Researchers had previously reported that for one strain of D. mojavensis, from Catalina Island, off the southern California coast, mothers always produce sterile sons when crossed to D. arizonae males.

Because the hybrid male sterility trait depends on the mother's genetic heritage, Reed and Markow concluded that the genetic change--polymorphism, in evolutionary biology parlance--responsible for creating sterile sons must not yet be "fixed," or firmly established in D. mojavensis populations. And that is a telltale sign that the change was recent.

Reed wanted to know just how deeply the polymorphism causing male sterility had suffused Catalina Island D. mojavensis populations. In other words, do all or just some of the Catalina Island mothers produce sterile sons when mated to D. arizonae males? When she did the experiment, she found that only about half the crosses resulted in sterile sons. That result implies that only half the females in the Catalina Island population had the gene (or genes) for hybrid male sterility.

Surprisingly, when she tested D. mojavensis females from other geographic regions, she found that a small fraction of those populations also exhibited the hybrid male sterility polymorphism. "That polymorphism exists in every population I looked at," Reed said. "It just happens to be that whatever factors are causing sterility are at higher
'"/>


7-Jun-2004


Page: 1 2 3

Related biology news :

1. Tracing genes, biologists show lizard migration is traced to Florida
2. UCLA molecular biologists uproot the tree of life
3. UCSD biologists develop super-endurance strain of mice
4. Springtime blooms seen earlier now than in the past, say Boston University biologists
5. UCSD biologists discover cells defense mechanism against class of disease-causing bacterial toxins
6. U of T microbiologists achieve results with pattern recognition software
7. Carnegie Mellon U biologists identify critical player in yeast ribosome assembly
8. Plant biologists Delmer, Quail, Bennetzen elected to National Academy of Sciences
9. New York microbiologists awarded research grants in antibiotic resistance and lyme disease
10. Purdue biologists expose the inner workings of viral machine
11. Protein-hungry cells go fishing, report Purdue biologists

Post Your Comments:
*Name:
*Comment:
*Email:
TAG: Parting genomes biologists discover seeds speciation

(Date:7/30/2014)... Scientists studying the potential effects of climate change ... focusing on the wrong factors, according to a ... Wildlife Conservation Society, University of Queensland, and other ... conservation science is missing the point when it ... majority of climate change scientists focus on the ...
(Date:7/30/2014)... points is a straight line, and now Harvard researchers ... axiom to heart. , Though competition among individual ... racing for the chance to fertilize the egg, Harvard ... that allow them to take a straighter path to ... Heidi Fisher, a post-doctoral student working in the lab ...
(Date:7/30/2014)... Governing Board of the Entomological Society of America (ESA) ... 2014. The election as a Fellow acknowledges outstanding contributions ... research, teaching, extension, or administration. The following Fellows will ... Meeting -- which will be held November 16-19, 2014 ... is a professor with the Department of Plant, ...
Breaking Biology News(10 mins):Conservation scientists asking wrong questions on climate change impacts on wildlife 2When cooperation counts 2When cooperation counts 3Entomological Society of America recognizes 2014 fellows 2Entomological Society of America recognizes 2014 fellows 3Entomological Society of America recognizes 2014 fellows 4Entomological Society of America recognizes 2014 fellows 5Entomological Society of America recognizes 2014 fellows 6Entomological Society of America recognizes 2014 fellows 7Entomological Society of America recognizes 2014 fellows 8Entomological Society of America recognizes 2014 fellows 9Entomological Society of America recognizes 2014 fellows 10Entomological Society of America recognizes 2014 fellows 11Entomological Society of America recognizes 2014 fellows 12Entomological Society of America recognizes 2014 fellows 13Entomological Society of America recognizes 2014 fellows 14Entomological Society of America recognizes 2014 fellows 15Entomological Society of America recognizes 2014 fellows 16Entomological Society of America recognizes 2014 fellows 17
(Date:7/30/2014)... Columbia, MD (PRWEB) July 30, 2014 ... announces today the release of the REVELERIS® ... allows organic chemists, preparative chromatographers, and other researchers ... (LC) using a single unit. , With the ... between flash and preparative chromatography modes with a ...
(Date:7/30/2014)... 30, 2014  Decision Resources Group finds that ... in the United States ... penetration will be the level of savings achievable ... expected lower cost to patients. Payers plan to ... their pricing expectations in order to encourage physician ...
(Date:7/30/2014)... SAN FRANCISCO , July 30, 2014 /PRNewswire/ ... Transplant Congress evaluated the safety and efficacy of ... antibody-mediated rejection following kidney transplants in highly sensitized ... important inhibitor of the complement system. ... results in significant increases in the levels of ...
(Date:7/30/2014)... 2014  The Chicago Bears are excited to announce ... (Academy) in an effort to raise awareness of skin ... free SPOT me™ skin cancer screenings at a preseason ... SPOT me™ is an educational campaign designed to ... risks of skin cancer, and encourages people to get ...
Breaking Biology Technology:Grace Launches New REVELERIS® Prep Purification System 2Surveyed U.S. Payers Expect Cost Savings to MCOs and Patients to be the Strongest Drivers of Biosimilar Uptake 2Surveyed U.S. Payers Expect Cost Savings to MCOs and Patients to be the Strongest Drivers of Biosimilar Uptake 3Study Suggests C1-INH May Aid in Prevention of Antibody-Mediated Rejection Following Kidney Transplant 2Study Suggests C1-INH May Aid in Prevention of Antibody-Mediated Rejection Following Kidney Transplant 3Chicago Bears Join the American Academy of Dermatology in Fight against Skin Cancer 2Chicago Bears Join the American Academy of Dermatology in Fight against Skin Cancer 3Chicago Bears Join the American Academy of Dermatology in Fight against Skin Cancer 4
Cached News: