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Tag: "sibling" at biology news

Scientists detect probable genetic cause of some Parkinson's disease cases

... the collection of this large groupof families and sibling pairs, which is proving to be an invaluableresource for these studies," says Diane Murphy, Ph.D., a programdirector at NINDS. "Because the prevalence of this mutation is 5percent in families with a history of the disease and it is relativelycommon ev...

Did humans cause ecosystem collapse in ancient Australia?

...s in the lightest, 12C. About 1% is 13C, a heavier sibling with an additional neutron. There is even less 14C, the unstable, radioactive heavyweight of them all. "13C is the key," Fogel explained. "There are two main ways plants metabolize 13C . About 85% of plants belong to what is known as C3 photosynthes...

Environment, not genes, key in family relationships

...ause the data the researchers were using came from sibling pairs of varying degrees of genetic relatedness, ranging from identical twins to genetically unrelated children in families formed by remarriages, the researchers were able to identify those traits that had a greater correlation with environmental co...

Evolutionary shifts in olfactory sensitivities in fruit flies

... feeds from multiple fruit types, with that of its sibling species D. sechellia, a specialist particularly dr...portant model organism for research. However, nine sibling species of D. melanogaster are less well characterized. One of these species, D. sechellia--as its n...

Striking the right balance between excitation and inhibition

...degree of Notch expression on one neuron tells the sibling cell that it cannot be the same thing. If it is up-regulated in one cell, Notch will be down-regulated in its sibling. "There are thousands of different kinds of neurons in our incredibly complex nervous system, and we don't understand how this diver...

New genetic analysis forces re-draw of insect family tree

...ibolium castaneum), honey bee (Apis mellifera) and sibling parasitic wasp species (Nasonia vitripennis and Nasonia giraulti). These insects represent the four major orders of holometabolous insects, beetles (Coleoptera), moths (Lepidoptera), flies (Diptera) and bees and wasps (Hymenoptera), which togethe...

Perceived facial similarity in children is an estimate of kin recognition

..., participants were asked to classify each pair as sibling or non-siblings. Researchers found that the mean similarity ratings of the first group contained as much information about genetic relatedness as did the actual judgments of genetic relatedness by the second group. These ratings could also be transf...

Does a peptide affect the heart's response to social isolation?

...o either social isolation or pairing with a female sibling (control conditions) for four weeks. They were treated with oxytocin or saline (control solution) daily for 14 days during the third and fourth week of the four-week isolation period. Electrocardiographic parameters (heart rate and heart rhythms)...

Some caterpillers just don't want to grow up

..., but cannot explain it on their own. In contrast, sibling competition and "segregation" ?cohorts from both years do not always compete because infected ant colonies avoid re-infection in the next season ?favor evolutionary stable fractions of slow developers up to 50%. However, among all arguments suggested...

The penalty of having a sister -- why sibling sex matters for male saiga antelopes

...ve scientists a new insight into the importance of sibling sex and what implications this may have for the an...rth. Future research will investigate what role sibling sex plays for lifetime reproductive success. The monitoring protocol of saiga antelopes is currently...

Philandering female felines forgo fidelity

...her carnivores, most of which consist of single or sibling males monopolizing many females. “It seems that female cheetahs are highly promiscuous with no detectable mate fidelity between breeding seasons,” said Dr. Sarah Durant, a researcher with the Wildlife Conservation Society/Tanzania Cheetah Conserva...

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