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Tag: "offspring" at biology news

Poor prenatal nutrition permanently damages function of insulin-producing cells in the pancreas

...outwardly different about them." The two groups of offspring ate the same chow diet, maintained a similar weight, and neither group was allowed to become overweight, eliminating this common risk factor for diabetes. The only difference was that the mothers had been fed differently during the final week. As th...

Cytoplasm affects the number of vertebrae in carp-goldfish clones

...ins a report of some intriguing findings in cloned offspring created when nuclei from one genus of fish were tr...ss in producing carp-goldfish clones is low--seven offspring in 501 attempts in this study--the authors believe that cross-species transplantation will lead to i...

Same mutation aided evolution in many fish species, Stanford study finds

... Eda gene. When those fish bred, some gave rise to offspring with two copies of the mutation and no (or reduced) body armor. In a freshwater habitat those fish prospered and populated the stream or lake with similarly armorless offspring. Kingsley said this work is part of a larger study to understand how evo...

Introduced foxes transformed vegetation on Aleutian Islands from lush grasslands to tundra

...r of the paper. "Most seabirds only have a single offspring each year, so their capacity for population increase is quite low. The foxes are mostly off the islands now, but we will probably continue to see the effects for a long time," Estes said. In addition to Croll and Estes, the authors of the Science pa...

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

...l like the grandparents. Under Mendelian laws, the offspring should have shown the same mutation. The first cl... apply was the discovery of normal flowers on some offspring of mutant plants. In the deformed parents, the flowers were fused into tight balls. But in the grand...

Love at first smell

...ales with insufficient MHC molecules would provide offspring with the ideal number of MHC types. However, when the perfume was added to males that already had the ideal range of MHC molecules, females could also be fooled into believing that these males smelled repulsive: having too many immune genes for offsp...

Sexual cooperation: Mating increases longevity in ant queens

... of their mate for the rest of their lives. Sexual offspring are only produced after several months or years of colony growth, during which a sterile worker force is built up in the population. The fact that mates bond so early reduces the conflict between mating partners because both sexes benefit from the qu...

How the environment could be damaging men's reproductive health

... the implications of these changes on sex ratio of offspring as the number of children born to these fishermen was small. "However, we think the fact that exposure to environmentally derived chemicals can change the sex chromosome ratio in sperm is worrying in itself and requires more attention from scientist...

Same-Sex Mating Discovered in a Toxic Fungus

..."Sex is generally beneficial as a means to produce offspring with different gene combinations that can adapt more rapidly to new environments," said HHMI investigator Joseph Heitman, M.D., Ph.D., of Duke, senior author of the study. "The findings suggest for the first time that the fungus has developed a nove...

Maine Researchers Find Exceptions to Old Rules of Genetic Inheritance

...ass the t haplotype to nearly 100 percent of their offspring (a phenomenon known as "transmission ratio distortion")-practically twice the Mendelian prediction. Stranger still, male and female mice that inherit the t haplotype from both parents typically do not survive, but in the rare instances when they do,...

To sea or not to sea: When it comes to salmon sex, size sometimes doesn't matter

...ibute of salmon as homing," he says. "Perhaps the offspring should be called strays only if they are unsuccess...y perspective, a mixture of homing and straying by offspring is a way that parents can spread the risk because offspring don't spawn in the same place. One of Qu...

Report that delayed motherhood decreases life expectancy of mouse offspring

...nown. However, other potential negative effects on offspring from delayed motherhood have been only anecdotal. ... Several other aspects of reproductive fitness of offspring were assessed, but none showed significant deleterious effects. This report identifying effects of ...

Making Sure Sacred Sheep Don't Become Extinct

... a ewe from a different sheep breed. The resulting offspring would be 50 percent Churro. The process would be repeated using a female offspring, making the next generation 75 percent Churro. They keep doing this until the sheep are 93 percent Churro. The collection could also be used by breeders or researcher...

Mother birds increase progesterone to hatch females

... it is the female's sex chromosome that determines offspring sex. Now, Cornell University researchers think the...l bird species use to bias the sex ratios of their offspring toward female. By experimenting with domestic chickens, they have determined that the presence of h...

Radio-tracking associated with 'dramatic shift' in water vole sex ratio

...mothers with access to poor resources will produce offspring of the sex most likely to disperse and therefore reduce local competition for resources. "Radio-collars clearly have the potential to cause some stress to water voles, and it is possible that this might stimulate sex-ratio adjustment as part of an e...

Alarm pheromone causes aphids to sprout wings

...pheromone also causes pea aphids to produce winged offspring that leave their host plant when mature. Because some plants can also release (E)-â-farnesene, they could in theory manipulate aphids into flying away. However, aphids were shown to react mainly to the frequency of pheromone release and not the actu...

Butterfly migration could be largest known

...neration will fly as far as southern Oregon. Their offspring will fly on to reach British Columbia by summer, before heading south again in the fall. ...

Unlike other mammals, newborn dolphins and orcas stay active 24/7 during first months of development

... levels. As the newborns grow, neither mothers nor offspring show counterbalancing increases in rest that would indicate accumulated sleepiness. All mammals previously studied have maximum rest or sleep behavior at birth with amounts gradually decreasing to adult levels. In fact, past findings that sleep depr...

Scientists discover odd-ball rodent

...a nocturnal vegetarian. It also gives birth to one offspring at a time, rather than a litter. Dr. Timmins, who also discovered a new species of striped rabbit from the same region in 1999, warns that habitat protection and regulations to reduce unsustainable commercial hunting are vital to safeguarding remain...

Certain fish have a special mating preference

...enitalia types. In the laboratory Langerhans took offspring of Texas mosquitofish from both environments and r... that gonopodia size was larger in the lab for the offspring of parents collected in predator-free environments ?just as in the field ?proving heritability. Sex...

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