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:3/3/2015)... FOREST, Calif. , March 3, 2015 ... the leading provider of advanced cryogenic logistics ... markets including immunotherapies, stem cells, cell lines, ... and reproductive medicine, today announced the expansion ... Cancer Research Centers, ("Fred Hutch") Clinical ...
(Date:2/24/2015)... , Feb. 24, 2015 This report analyzes the ... provides separate comprehensive analytics for the US, Canada ... , Asia-Pacific , Middle ... Annual estimates and forecasts are provided for the period 2013 ... these markets. Market data and analytics are derived from primary ...
(Date:2/18/2015)... (NASDAQ: CPHD ) today announced that its executives ... to participate via webcast. , Cowen and Company Health ... 3, 2015 at 11.20 a.m. Eastern Time , Raymond ... Wednesday, March 4, 2015 at 10.25 a.m. Eastern Time ... these events, please visit Cepheid,s website at http://ir.cepheid.com ...
Breaking Biology News(10 mins):Cryoport, Inc. Expands Support of Fred Hutchinson Cancer Research Center's Clinical Research Division 2Cryoport, Inc. Expands Support of Fred Hutchinson Cancer Research Center's Clinical Research Division 3World Iris Biometrics Industry 2World Iris Biometrics Industry 3World Iris Biometrics Industry 4World Iris Biometrics Industry 5World Iris Biometrics Industry 6World Iris Biometrics Industry 7World Iris Biometrics Industry 8World Iris Biometrics Industry 9World Iris Biometrics Industry 10World Iris Biometrics Industry 11Cepheid to Webcast Upcoming Financial Presentations 2
(Date:3/3/2015)... , March 3, 2015 NASA astronaut Scott ... this month to spend a year living and working on ... interviews from 5:30 to 7 a.m. EDT Monday, March 9. ... as he completes the final weeks of his training. ... video on NASA Television highlighting his mission training and previous ...
(Date:3/3/2015)... 03, 2015 Research and Markets ( ... "Gene Therapy Market, 2015 - 2025" report to ... 2015-2025" report provides an extensive study on the marketed ... been carried out in this field for over a ... available in Asian markets; one approved in the EU). ...
(Date:3/3/2015)... -- Adaptive Biotechnologies announced today that Chad Cohen ... Director as Chair of the Audit Committee. ... all finance, treasury and accounting functions. Since joining Zillow ... and accounting functions, and led the finance organization through ... was named Puget Sound Business Journal,s CFO of the ...
(Date:3/3/2015)... LITTLE FALLS, N.J. , March 3, 2015 /PRNewswire/ ... a biotechnology company specializing in the development of and ... of damaged tissues and organs, announced today that it ... Purchase Agreement with Amarantus Bioscience Holdings, Inc. (OTC Bulletin ... required under the Agreement, Amarantus made the final payments ...
Breaking Biology Technology:NASA Astronaut Scott Kelly Available for Interviews before One-Year Space Station Mission 2Global Gene Therapy Market Report 2015-2025 - Extensive Study on the Marketed and Pipeline Gene Therapies 2Global Gene Therapy Market Report 2015-2025 - Extensive Study on the Marketed and Pipeline Gene Therapies 3Global Gene Therapy Market Report 2015-2025 - Extensive Study on the Marketed and Pipeline Gene Therapies 4Global Gene Therapy Market Report 2015-2025 - Extensive Study on the Marketed and Pipeline Gene Therapies 5Global Gene Therapy Market Report 2015-2025 - Extensive Study on the Marketed and Pipeline Gene Therapies 6Global Gene Therapy Market Report 2015-2025 - Extensive Study on the Marketed and Pipeline Gene Therapies 7Adaptive Biotechnologies adds Chad Cohen, Zillow Group CFO, to Board of Directors 2Regenicin (RGIN) Receives $2.3 Million in Final Payment from Amarantus 2Regenicin (RGIN) Receives $2.3 Million in Final Payment from Amarantus 3
Cached News: