News tagged with population size
Related topics: population
In population genetics and population ecology, population size (usually denoted N) is the number of individual organisms in a population.
The effective population size (Ne) is defined as "the number of breeding individuals in an idealized population that would show the same amount of dispersion of allele frequencies under random genetic drift or the same amount of inbreeding as the population under consideration." Ne is usually less than N (the absolute population size) and this has important applications in conservation genetics.
Small population size results in increased genetic drift. Population bottlenecks are when population size reduces for a short period of time.
Overpopulation may indicate any case in which the population of any species of animal may exceed the carrying capacity of its ecological niche.
This text uses material from Wikipedia and is available under the GNU Free Documentation License.
(Medical Xpress)—A study dating the age of more than 1 million single-letter variations in the human DNA code reveals that most of these mutations are of recent origin, evolutionarily speaking. These kinds ...
Genetics Nov 28, 2012 | 4.5 / 5 (4) | 1 |
The world population could top 8 billion in the year 2023 if current growth rates remain constant, according to United Nations figures. However, if global fertility rates slow more quickly than expected, there could be up ...
Health Apr 30, 2013 | not rated yet | 0
(Medical Xpress)—Neurobiologists at the Research institute of Molecular Pathology (IMP) in Vienna have discovered one of the key genes required to make a brain. Mutations in this gene, called TUBB5, cause ...
Genetics Dec 14, 2012 | 5 / 5 (2) | 0 |
Screening for lung cancer with low-dose computed tomography (LDCT) in all screening-eligible current and former smokers has the potential to avert approximately 12,000 lung cancer deaths each year in the United States. That ...
Cancer Feb 25, 2013 | 5 / 5 (1) | 0
The global cancer burden is set to surge more than 75% by 2030, according to new research published Online First in the Lancet Oncology. The rise is predicted to be even larger in the developing world, with the poorest countr ...
Cancer May 31, 2012 | 5 / 5 (2) | 0 |
Curtin University researchers have found that women who breastfeed their babies have significantly reduced rates of ovarian cancer in a study that extends what was known about the beneficial effects of breastfeeding on mothers.
Cancer Feb 01, 2013 | 5 / 5 (1) | 0
A new article by Dr. Luisa N. Borrell, the chair of Lehman College's Department of Health Sciences, explores the disparities in periodontal disease (gum disease) among U.S. adults along age, sex, racial/ethnic and socioeconomic ...
Dentistry Aug 28, 2012 | not rated yet | 0
Surveys of drug use form an important basis for the development of effective drug policies, and also for measuring the effectiveness of existing policies. For the first time in history, scientists have now made direct comparisons ...
Addiction Jul 26, 2012 | not rated yet | 0
(Edmonton, Canada) Access to health care and the usage of emergency departments are popular topics in the news.
Other Aug 11, 2011 | not rated yet | 0