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:


(Date:11/17/2016)... 2016  AIC announces that it has just released a new white paper authored ... scale-out plus high speed data transfer storage solutions. Photo - http://photos.prnewswire.com/prnh/20161116/440463 ... ... ... Setting up a high performance computing or HPC system ...
(Date:11/15/2016)... Research and Markets has announced the addition ... report to their offering. ... The global ... from USD 6.21 Billion in 2016, growing at a CAGR of ... bioinformatics market is driven by the growing demand for nucleic acid ...
(Date:6/27/2016)... , June 27, 2016 Research and ... North America 2016-2020" report to their offering. ... North America to grow at a CAGR of ... been prepared based on an in-depth market analysis with inputs from ... prospects over the coming years. The report also includes a discussion ...
Breaking Biology News(10 mins):
(Date:12/8/2016)... ... 2016 , ... Lajollacooks4u, San Diego’s premier team building events and cooking events ... program offerings and company expansion. , This is largely due to its ... over 30 people. Ever since, Lajollacooks4u has seen significant demand for its services from ...
(Date:12/8/2016)... ... December 08, 2016 , ... From wearable devices that can ... sports. On Thursday, December 15th a panel of entrepreneurs, innovators and a Philadelphia ... at a Smart Talk session. Smart Talk will run from 8:30 – 10:30 ...
(Date:12/8/2016)... SAN DIEGO , Dec. 8, 2016 /PRNewswire/ ... presented demonstrating the role of the Breast Cancer ... stage, ER+ breast cancer are most at-risk for ... therapy. Data include results from three studies advancing ... provide information related to tumor biology and inform ...
(Date:12/8/2016)... Dec. 8, 2016 Eurofins announces the appointment of ... of Eurofins Scientific Inc. (ESI). Mr. Murray will ... professional and entrepreneurial experience in leading international business teams. As the ... testing market to uphold Eurofins, status as the global leader in ... , ...
Breaking Biology Technology:
Cached News: