Articles tagged with Evolutionary Genetics
Researchers at Duke University used nuclear genes to analyze genetic material from 15 mammal species, providing statistically unambiguous results in favor of the Theria hypothesis. This contradicts the Marsupionta hypothesis supported by mitochondrial DNA method, which links disparate animals like kangaroos and whales.
A study by Jonathan B. Losos and Dolph Schluter found that the diversity of lizard species on larger Caribbean islands is primarily due to evolutionary processes, rather than colonization and extinction. The researchers used the Caribbean lizard phylogeny to estimate the number of immigration and speciation events on the islands.
Researchers at University of Wisconsin-Madison identify gene called bric-a-brac that establishes sex differences in body pigmentation, with males under pressure to evolve new traits to stay competitive. The discovery provides a window into ongoing evolutionary processes and sheds light on the genetic basis of sex differences.
Researchers found that young birds can recognize and prefer learning the songs of their own subspecies over other types. The study also revealed that birds have a more finely detailed sense of song than previously thought. After tutoring, two-thirds of the birds chose to sing their own subspecies' song.
Researchers use 18th-century formula to reconcile DNA study discrepancies and create more consistent picture of evolution's history. By considering all possible evolutionary trees, Bayesian mathematics allows for a more accurate understanding of the evolutionary history of life.
Researchers identified distinct regions in the DNA where random genetic changes are more likely to benefit or harm an organism, suggesting a potential way to analyze genetic information from humans and other species. The study's findings could aid in understanding how life developed various proteins.
HHMI researchers found that yeast prions can transmit phenotypes through protein-protein interactions, hinting at the presence of undiscovered protein-based 'genetic elements'. This discovery offers a powerful new technique for exploring cells' machinery by selectively turning off specific proteins.
Researchers found that genes involved in male reproductive processes, such as sperm production and morphology, have evolved at a faster rate than non-sexual genes in humans. This accelerated evolution is attributed to sexual pressure, including competition for mating success and internal sperm competition.
Researchers discovered that humans carry a snippet of DNA resembling an HIV gene sequence, known as HERV-K, which has been present in the human genome for over 30 million years. The virus's Rev protein, similar to HIV's, helps with viral replication and may have implications for xenografts and viral infection strategies.
The X and Y chromosomes are thought to have originated from a pair of identical autosomes, diverging over 300 million years through four discrete stages. This divergence led to the formation of distinct sex chromosomes, with X-Y genes serving as fossils for reconstructing their evolutionary history.
Researchers reconstructed the stages of sex chromosome evolution, tracing the modern X and Y chromosomes back to ordinary autosomes. The study found that these chromosomes differentiated into distinct blocks, with genes clustered together on one chromosome but scattered across the other.
Researchers have found that the ancestor of human sex chromosomes arose from an identical pair of standard chromosomes approximately 240-320 million years ago. This new evidence suggests that the first events creating sex chromosomes occurred earlier than previously thought, around 100 million years sooner.
Researchers discover that mobile DNA sequences, known as transposons, generate chromosomal inversions in the Drosophila fly. These inversions are found in small independent DNA sequences and have a positive role in evolution.
The University of Chicago's symposium on evolutionary developmental biology will explore new perspectives on animal evolution. Keynote speakers and organizers aim to challenge traditional views on the complexity of ancient organisms that gave rise to diverse phyla.
Researchers study hybrid species' genetic makeup and impact on ecosystems, challenging existing paradigms. Some studies find hybrids to be more fit than their parents in certain environments, while others reveal increased susceptibility to parasites.
A study at the University of Pennsylvania Medical Center found that certain retrotransposons can pick up flanking genetic sequences and insert themselves along with tag-along DNA, creating novel genetic combinations. This mechanism may contribute to evolutionary change in humans and other mammals by generating genomic diversity.
Scientists from the University of Wisconsin-Madison describe a genetic trick that helps explain the diversity of patterning and color on butterfly wings. This trick is also believed to be used among animals, enabling the emergence of new morphological characteristics through evolution.
Researchers at the University of Chicago have discovered a gene that causes male progeny of two recently separated species to be sterile, hinting at an early indicator of speciation. The homeobox gene is evolving rapidly due to its role in controlling male sexual function, leading to sibling species incompatibility.
Researchers successfully revived bacteria extracted from ancient bees preserved in amber, opening up new possibilities for pharmaceuticals and industrial applications. Ancient plant specimens are also being studied to understand genetic evolution and identify potential biocontrol uses.
A recent DNA study by Alan R. Templeton reveals that the genetic variation among humans is primarily individual-level, with most differences too small to define distinct racial lines. The research challenges the notion of human races as a scientifically valid concept.
The sensory exploitation theory suggests that animals choose mates using sensory systems shaped for daily survival needs, rather than solely for sexual attraction. This model proposes that animals have built-in preferences for traits unrelated to genetic fitness, which can be seen in examples such as water mites mimicking copepod vibra...
Evolutionary biologist H. Allen Orr proposes a new theory on the genetic foundations of adaptation, challenging standard theory that only tiny genetic changes contribute to adaptation. Orr's work uses mathematical modeling and computer simulations, suggesting that a mix of minor and major genetic changes can lead to adaptation.
A new hypothesis proposes that a 71,000-year-old volcanic winter and subsequent 1,000-year ice age led to widespread famine and death, causing a significant bottleneck in human populations. This event is believed to have resulted in rapid genetic divergence among modern humans.
Researchers find that the Jamaican tree crab and its relatives are not related to ocean-dwelling crabs but evolved from a common Jamaican marine ancestor. The species made a rapid evolutionary leap, adapting to their new environment in just 4 million years.
A massive gene study suggests that mammals first evolved around 100 million years ago during the Cretaceous era, much earlier than previously estimated. The research used genetic data from over 10,000 species to infer origin dates, contradicting fossil-based estimates that linked mammal evolution to mass extinctions.
Anthropologists Milford Wolpoff and Rachel Caspari propose a multi-regional theory of human evolution, suggesting that populations evolved concurrently in various regions over two million years. This perspective has significant social and political implications, as it challenges the concept of a single common ancestor.
Researchers have discovered powerful evidence that an ancient common ancestor invented a set of body-building genetic machinery that has survived to this day. This discovery revolutionizes our understanding of the origin of animal life, as it reveals that the development of appendages was solved just once in the distant past.
Sexual reproduction in brewer's yeast found to be better at removing harmful genetic mutations than single-sexed populations. This could explain why humans and other vertebrates evolved to have two parents instead of cloning themselves.
A study by Cornell University biologist Stephen T. Emlen found that evolutionary predispositions, such as helping closely related kin, can lead to conflict and violence in modern families. The biologist suggests that increasing awareness of these inherited behaviors can help minimize damage in stepfamily situations.
Researchers at the University of Chicago Medical Center have identified a mutation in a small flowering plant that disrupts male-female communication, leading to pollen tubes wandering aimlessly. This defect is similar to self-sterility observed in many plant species, which helps maintain genetic diversity.