Tag: "chimps" at biology news
Of lice and men
... years ago, consistent with previous evidence that chimps
and human ancestors diverged from a common ancestor about 5.5 million years ago. The study also supports the controversial view that there was a "bottleneck" or reduction in the global Homo sapiens population to only about 10,000 peo...
Chimpanzee 'workshop' discovered in Congo
...mber issue of the journal The American Naturalist, chimps
living in the 100-square-mile "Goualougo Triangle"...ugh earlier studies have documented tool use among chimps
in eastern Africa and other regions, authors Crickette Sanz of Max Planck Institute for Evolutionary...
Endurance running may be key to evolution of human body form
...ramble that neither the earliest prehumans nor the chimps
that are their nearest relatives have a nuchal rid...y to mind is our shoulders. The burly shoulders of chimps
and australopithecines are connected to their skulls, the better to climb trees and swing from branc...
How running made us human
...ime a foot hits the ground." Long legs, which chimps
and australopithecines lack, let humans to take huge strides when running, Bramble says. So do ligaments and tendons including the long Achilles tendon which act like springs that store and release mechanical energy during running. The tendons and ...
Chimpanzee brains are asymmetrical in key areas and their handedness reflects it
...same time, just as in humans, the amygdalas of the chimps
were symmetrical. Studies such as this confir... influence behavior. Given the new findings about chimps
and previous findings that the limbic system affects human facial expression and emotions, it now se...
Anthropologists find 4.5 million-year-old hominid fossils in Ethiopia
...mond-shaped upper canines, not the "v"-shaped ones chimps
use to chomp. Outwardly, however, A. ramidus would appear a lot more chimpanzee-like than human. Gona has turned out to be a productive dig site. In a Nature cover story (Jan. 23, 1997), Semaw and colleagues reported the oldest known stone tools use...
Hominids lose control
...itional 140,000 harmful mutations since humans and chimps
diverged, mutations that have been selectively eliminated in mouse and rat. The authors compared the conservation of DNA sequences making up the bulk of gene-regulating elements and found marked conservation in the regulatory regions between mice an...
Gorilla diet tips -- Have we 'evolved to eat mush'?
...-year field study of mountain gorillas living with chimps
in Uganda offer intriguing new clues to the evolut...ments, he said, gorillas compete aggressively with chimps
for available meat sources, and offer useful clues to the dietary adaptations of our early hominid a...
Animal parenting, personality and pair-ups
...ientiousness and dependability are only present in chimps
and humans, according to Gosling. Some of the parenting behaviors by monkey also resemble human parenting, Dario Maestripieri of the University of Chicago said. In his research on the development of maternal responsiveness he has found that both youn...
Can our genes tell the story of our divergence?
...red 13,731 genes in humans to their equivalents in chimps
to find positively selected genes in both species. Nielsen et al. identified many genes involved in sensory perception, as well as spermatogenesis, but found the strongest evidence for positive selection in genes related to immune defense. Immuni...
DOE JGI sequences DNA from extinct cave bear
...could be compared to humans. Then, if you include chimps
in that comparison, Rubin said, you would gain insight into the genomic changes between chimps
and hominids and help describe the chain of evolutionary events that led to humans. "This research r...
Gene expression in the aging brain
...data studies performed in old and young humans and chimps
in four different regions of the cortex (the brain...ferent between humans and chimps. Since humans and chimps
diverged about 5 million years ago - these changes have accumulated over a relatively short evolutio...
Poaching, logging, and outbreaks of Ebola threaten central African gorillas and chimpanzees
...ies Survival Commission. ''Protecting gorillas and chimps
is not just important in its own right. These animals are also flagship species, important symbols for vast areas of forest that are among the richest on Earth. Protecting them protects many other species as well." The continuing spread of the Eb...
Big differences in duplicated DNA distinguish chimp and human genomes
...the change to the overall genome landscape between chimps
and humans can be attributed to large segmental du... copy of a segment in an ancestral species of both chimps
and humans, and after the species split off from each other, that segment was duplicated many times ...
Human Y chromosome stays intact while chimp Y loses genes
...to the chimp's mating habits. Both male and female chimps
engage with multiple partners when they mate. This gives a strong selective pressure on those genes that produce sperm. Conversely, it puts less pressure on evolution to preserve those genes on the Y whose functions have nothing to do with reproducti...
A new view of human-chimpanzee genome differences
...s a 2.7 percent difference, base per base, between chimps
and humans," said Eichler. "So when we talk about how similar chimps
and humans are, we really need to be careful that we are referring to variation in the whole genome ...
Human Y chromosome preserves itself better than the chimp Y
...enes useless. About 6 million years ago humans and chimps
shared a common ancestor, Page explained. Since th...s about that common ancestor" shared by humans and chimps
some 6 million years ago. By examining and comparing the Y chromosomes from both species, "we're get...
New genome comparison finds chimps, humans very similar at DNA level
...s and deletions are taken into account, humans and chimps
still share 96 percent of their sequence. At the p...cent of genes code for the same amino sequences in chimps
and humans. In fact, the typical human protein has accumulated just one unique change since chimps
More males chimps means more territorial patrols, study shows
...ey will launch an attack." During the attacks, the chimps
beat and often kill their neighbors. The groups a...ies. This means that like humans living in a town, chimps
form cliques and aren't all together in one place at the same time. But on patrol days, researchers ...
Flipped genetic sequences illuminate human evolution and disease
... research, only nine inversions between humans and chimps
had been identified. Using a computational approach, Scherer's group identified 1,576 presumed inversions between the two species, 33 of which span regions larger than 100,000 base pairs--a sizeable chunk of DNA. The average human gene is smaller, on...