News tagged with population size

Related topics: population

Yeast studies suggest alternative cancer approach

Yeast populations exposed to a sudden environmental shock can be driven to extinction, MIT researchers have shown. Could this principle also apply to human cancer cells? Possibly, argue researchers from MIT, ...

May 05, 2014
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A key gene for brain development

(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 ...

Dec 14, 2012
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Cancer incidence predicted to increase 75 percent by 2030

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 ...

May 31, 2012
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The plus side of population aging

Around the world, people are living longer and having fewer children, leading to a population that is older, on average, than in the past. On average, life expectancy in developed countries has risen at a pace of three months ...

Sep 24, 2014
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Ovarian cancer risk reduced by prolonged lactation

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.

Feb 01, 2013
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Population size

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 licensed under CC BY-SA