Articles tagged with Population Genetics
A new study by University of Otago researchers has discovered that the modern New Zealand sea lion is a relative newcomer to the mainland, replacing an extinct prehistoric species. The team found evidence of a previously unknown lineage that dominated South Island shores until around 600 years ago.
Genetic analysis of fossilized feces on Tiburón Island in Mexico suggests the island was once home to a native bighorn sheep population. The discovery raises questions about the species' extinction and potential rewilding efforts.
A 15-year study on P. vivax population genetics in South Korea found drastic genetic change occurred between 2002-2003, suggesting parasites were introduced from North Korea. This explains why South Korea was unable to eliminate vivax malaria for 20 years.
The Uros populations of Peru and Bolivia possess a unique genetic ancestry that predates the arrival of Spanish conquistadors, potentially dating back to 3,700 years ago. Their divergent genetic lineage is distinct from surrounding Andean populations.
A new study published in American Journal of Human Genetics suggests that modern-day India is the result of recent population mixture among divergent demographic groups. The findings provide evidence for a genetic mixture of two ancestral groups: Ancestral North Indians and Ancestral South Indians, which occurred around 1,900 to 4,200 ...
A recent genetic study has uncovered a significant demographic shift in India's population, occurring approximately 1,900-4,200 years ago. This mixture of ancestral populations has left its mark on nearly every group in India, influencing the present-day caste system and increasing the incidence of genetic diseases.
Researchers found that a specific gene polymorphism is associated with an increased risk of ischemic stroke in the Han Chinese population. The study identified the -607C allele as a strong risk factor for ischemic cerebrovascular disease, while the A allele may provide protective effects.
A new DNA study from the University of Texas at Austin provides genetic evidence for the impact of Aztec imperialism on Mesoamerican populations. Researchers found that the pre-conquest maternal aDNA did not match those of the post-conquest era in Xaltocan, suggesting significant genetic changes
Researchers developed a new method to analyze genetic data to learn about population history, using the Ashkenazi Jews and Masai people as test subjects. This approach allows for detailed events in recent history to be recovered within the last few centuries.
A new study found that mountain lions are dispersing from Nevada to California, rather than the expected influx of animals from California into Nevada. The research used DNA analysis to track the movement of 739 mountain lions over seven years, revealing distinct genetic populations and habitat preferences.
A genetic study of cave millipedes in the southern Cumberland Plateau highlights the importance of conservation efforts for isolated species. The research found that these millipedes have reduced pigmentation, non-functional eyes, and diverged several million years ago.
Researchers have discovered genetically engineered canola populations growing outside of established cultivation regions along roadsides across North Dakota. These 'escaped' plants accounted for 45% of total roadside plants sampled and persisted from year to year, raising questions about oversight and monitoring protocols.
A Brazilian research team successfully established the first line of human embryonic stem cells (hES), but struggled to find a genetically diverse match for the diverse ethnic and genetic Brazilian population. The researchers overcame legal and ethical guidelines to create hES cell line BR-1, which is mostly European in origin.
Researchers introduce genetic changes into mosquito populations, paving the way for a genetically modified malaria-free mosquito species. The technology could lead to dramatic reductions in malaria-carrying mosquitoes and provide a safe public health tool.
Michigan Technological University researchers found an immigrant wolf in Isle Royale's gene pool through DNA analysis of scat samples. The introduction of new genes led to a decrease in inbreeding and increased survival rates among the wolves.
A recent study by Purdue University researchers used genetic methods to count endangered eagles, revealing significantly higher populations than visual counts. The technique identified individual DNA fingerprints for each bird, leading to more accurate estimates of population sizes.
Researchers used genetic data and oceanographic information from satellites to find two distinct populations of franciscanas in Argentina's coastal waters. The findings suggest that environmental factors, such as water temperature and turbidity, play a significant role in shaping population structure in marine animals.
The American College of Medical Genetics recommends offering genetic test for SMA to all couples, regardless of family history. The goal is to identify carriers and provide early testing options, while ensuring informed consent and access to reproductive resources.
New research suggests the Americas were colonized by approximately 1,000-5,000 people, with a 20,000-year layover in Beringia, where population size remained relatively stable. This three-stage colonization model provides a more complex scenario than previous theories, shedding light on the timing and scale of the initial migration.
Researchers used DNA sequence profiling to re-examine the giant panda population in Wanglang Nature Reserve, doubling earlier estimates and finding no genetic evidence of a demographic bottleneck. The study suggests the species may have a better chance of long-term viability than previously thought.
Researchers propose 'Darwinian debt' as a key factor in fish stock depletion, suggesting that species' inability to adapt to changing environmental conditions leads to population decline. This concept challenges traditional views on conservation and management strategies for marine ecosystems.
Researchers from Purdue University confirmed that eagles from central Asia are monogamous, with no adult straying from its mate. The study used non-invasive DNA analysis on feathers to track individual birds over a six-year period, providing valuable insights for conservation biologists.
Researchers at UCLA have pinpointed a specific region on chromosome 17 associated with autism in males. The discovery may help explain why girls are less likely to develop the condition, as the gene contributing to autism only affects boys.
Research using mitochondrial DNA identified two distinct populations in Algeria and Morocco as founders of the Gibraltar macaque population. The study found that the Gibraltar macaques retained a surprisingly high level of genetic variability despite long-term isolation.
A study of French Canadian families found a strong genetic link to restless legs syndrome on chromosome 12q, with periodic leg movements during sleep being a key distinguishing feature. The findings support the involvement of multiple genetic loci in the common sleep disorder.
A new tiger subspecies has been identified through a genetic analysis of over 130 tigers, suggesting six living subspecies rather than the traditional five. The study provides valuable data for conservation strategies and captive breeding programs to combat the decline of wild tiger populations.
A new species of coral-dwelling goby was found in Papua New Guinea and is closely related to another goby species. Genetic analysis reveals that the two species diverged from each other around 200,000 years ago due to host shift, suggesting sympatric speciation by host shift as a plausible explanation.
Researchers discover a ring species of greenish warblers with gradually changing behavioral and genetic characteristics encircling the Tibetan Plateau. The study reveals how small evolutionary changes can lead to reproductive isolation between species.
The Antioquian population in Colombia exhibits a high degree of European genetic influence, predominantly from southern Spain. This is reflected in the Y chromosome data, which show that 94% of males are of European descent.
The number of centenarians in the US is growing rapidly, with projections suggesting a doubling trend. The population is expected to become more diverse, with significant increases in Hispanic and Asian populations.
The Isle Royale wolf population has rebounded dramatically after years of decline, with 25 wolves counted this winter. High reproductive success by two packs and the availability of easy prey due to poor moose conditions contributed to the increase.
Researchers calculate that populations are going extinct at a rate three to eight times faster than species loss, with significant implications for ecosystem services and human dependence on nature. The study reveals the often-overlooked benefits of individual populations, including genetic material and crop production.
Research by Dr. Roger Rosenberg and colleagues found that people with one-fourth Cherokee or less ancestry had a lower risk of developing Alzheimer's disease, suggesting a potential protective genetic effect. The study suggests that ancestry may play a role in delaying the development of the disease after age 65.