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Tag: "progeny" at biology news

Plants defy Mendel's inheritance laws, may prompt textbook changes

...lant had two copies of a mutant gene could produce progeny that didn't show the parents' deformity, but rather were normal like the grandparents. Under Mendelian laws, the offspring should have shown the same mutation. The first clue that the classic inheritance rules didn't always apply was the discovery o...

To Stop Evolution: New Way Of Fighting Antibiotic Resistance Demonstrated By Scripps Scientists

...ronmental changes that maximize the chances that a progeny cell will be better adapted. In order to evolve, organisms have to mutate, so they turn on the mutation process when they are threatened with extinction. Romesberg reasoned that since mutations can be turned on full-force, perhaps they could be shut...

Random gene expression may drive HIV into hiding

...ly identical copies of itself, he found that these progeny did not all show the same behavior: some turned their viral expression on high and others turned it off. This dichotomy in cell fate from genetically identical cells is consistent with the idea that random fluctuations in gene expression control wha...

Using nanoparticles, in vivo gene therapy activates brain stem cells

...n ventricles, germinal cells that normally produce progeny that then die if they are not used," said Michal K. Stachowiak, Ph.D., co-author on the paper and associate professor of pathology and anatomical sciences in the UB School of Medicine and Biomedical Sciences. Stachowiak is in charge of in vivo studie...

Sandia completes depleted uranium study

...cognitive effects, as well as birth defects in the progeny of exposed veterans and civilians. Marshall's study concluded that the reports of serious health risks from DU exposure are not supported by veteran medical statistics nor supported by his analysis. Only a few U.S. veterans in vehicles accidentally ...

Scientists track stealth DNA elements in primate evolution

... evolution by surreptitiously spawning hyperactive progeny copies, giving rise to the most abundant family of...e and occasionally produce short-lived hyperactive progeny that contribute to the formation and expansion of Alu elements in the human genome. To date, the mo...

Newly recognized gene mutation may reduce seeds, resurrect plants

...ay hold the secret to how some flora protect their progeny during yield-limiting drought and other stresses, according to Purdue University scientists whose study of the plant led to discovery of a gene. The gene, called RESURRECTION1 (RST1), has revealed a previously unknown genetic connection between lipi...

Divergent mating systems and parental conflict as a barrier to hybridization in flowering plants

...interest in carefully partitioning resources among progeny to maximize their combined success. A new study in the September issue of The American Naturalist argues that with increased self-fertilization, parental conflict decreases. Consequently, parents from frequently selfing groups should be competitivel...

Regenerating worms help elucidate stem cell biology

...hat piwi plays a similar role in regulating the progeny of adult stem cells in humans. He cautioned that more work is needed to determine just how functionally similar the factors regulating stem cells in planaria are to those in higher organisms. But so far there's good evidence that many of the importan...

Same-sex mating by fungi spawned infection outbreak, evidence suggests

...an added. In a traditional sexual cycle, all alpha progeny inherit identical alpha genes from their alpha par...cryptic same-sex cycles that contribute to produce progeny with altered virulence, geographic or host range or other advantageous characteristics." Collaborat...

Islands in the Genome Promote Speciation

... produce fertile hybrid offspring in the wild, the progeny of lab matings appear to have no problems with fer... that are not favorable for the survival of hybrid progeny in nature. To study the genetic underpinnings of speciation, the researchers used DNA microarrays t...

Adult stem cells aid recovery in animal model of cerebral palsy

... produce fertile hybrid offspring in the wild, the progeny of lab matings appear to have no problems with fer... that are not favorable for the survival of hybrid progeny in nature. To study the genetic underpinnings of speciation, the researchers used DNA microarrays t...

USC researchers track down the stem cells that create feathers

...icle. As they proliferate and differentiate, their progeny is displaced upward to create a feather. When the bird molts, the quill of the feather is dislodged from the follicle with a tapered proximal opening-the very feature that has historically made feathers so useful as writing implements-leaving behind ...

Neurons find their place in the developing nervous system with the help of a sticky molecule

...nd it was subsequently inherited by their neuronal progeny that form layer 2/3 and blocked their ability to make MDGA1 protein. When Takeuchi and O'Leary examined the neocortex a few days later when the mice were born, they discovered that nearly all neurons containing the interfering RNA were stalled in ...

Sex: It's costly but worth it. Just ask a microbe

...reproduction produce genetically diverse and hardy progeny better able to withstand environmental changes, inhospitable conditions, lack of water, extreme temperatures and fewer nutrients," says Xu. There may be other benefits, too. "Every time DNA replicates and the microbes reproduce, mutations are intro...

For the first time: Longevity modulated without disrupting life-sustaining function

...focused on reproduction for a long life with fewer progeny and a tendency to halt larval development and enter a dormant, hibernation-like stage in which they can hang on for months but don't reproduce. Unless Smk-1 is missing, that is. Without Smk-1 to provide guiding assistance, DAF-16 is unable to slow...

It's all in the genes

...e is heritable on an ecosystem level. That is, the progeny of a tree are likely to support the same communities of organisms and ecosystem processes that their parents supported. It's a premise with far-reaching implications. Consider, for example, conservation efforts to preserve biodiversity in the face ...

Scientists discover role for dueling RNAs

...osome (a haploid cell) is forced into meiosis, the progeny won't survive. Fortunately, such destructive meiotic division is avoided in haploid cells because they continually produce IME4 antisense RNA, blocking the production of sense RNA. Antisense IME4, then, safeguards against meiosis in cells that can't ...

Mayo discovers protein as potential tactic to prevent tumors

...ithout propagating its damaging genetic message to progeny cells of its own." "As patients and their physicians seek to control or cure tumors, research is providing new approaches to limiting cancer from growing and spreading," Dr. Tindall said. "With this new understanding of the biology driven by criti...

New clues to how sex evolves

...nd reproduces very efficiently, producing over 200 progeny within a few days. Most C. elegans are hermaphrodites, which have two X chromosomes (XX), while some individuals are males with a single X chromosome (X0). The reproductive organs contain about half of the cells in an adult worm, and the process of m...

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