Population

Population pyramid showing steady mortality in each age group.
The age and gender distribution of a population within a given nation or region is commonly represented by means of a population pyramid.
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Population growth is changing of the amount of population over time. The term is often used informally in place of "Population growth rate".
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1. in ecology, the number of individuals of a population per unit of living space
2. in cell culture or tissue culture, the number of cells per unit area or volume
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z ...
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Population genetics is the study of the distribution of and change in allele frequencies under the influence of the four evolutionary forces: natural selection, genetic drift, mutation and migration.
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Population Cycles
The Carrying Capacity of the Environment
r-Strategists and K-Strategists
Population Density and Shifts in Strategy ...
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Populations evolve. [evolution: a change in the gene pool] In order to understand evolution, it is necessary to view populations as a collection of individuals, each harboring a different set of traits.
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Population genetics is basically genetics of the particular traits, or characters, of man, in the case of human population genetics, that then pass between generations with a particular population.
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Population Ecology
Define different types of population growth.
Analyze factors that affect population size.
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Population
A group of organisms of the same species relatively isolated from other groups of the same species. See deme.
Gamete ...
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Populations: Groups of similar individuals who tend to mate with each other in a limited geographic area. This can be as simple as a field of flowers, which is separated from another field by a hill or other area where none of these flowers occur.
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Population Genetics
Speakers presented work on characterizing extant haplotypes and developing maps describing typical distances up to which allelic variants can be expected to be in linkage disequilibrium.
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Populations of living things evolve
Evolution refers to changes in the genetic composition of a population. Genetic changes may result in changes in the physical or behavioral characteristics of the individuals.
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Population density. Number of individuals per unit area or volume
Porifera. The phylum comprising the sponges.
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population: an interbreeding group of individuals of one species occupying a defined geographic area.
predation: a relationship in which one population within a community may capture and feed upon another population.
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Population: A group of individuals of the same species within a given space and time.
Predaceous: Preying upon other organisms, predatory.
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population bottleneck
Type of genetic drift that occurs as the result of a population being drastically reduced in numbers by an event having little to do with the usual forces of natural selection.
population density ...
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Population. A local group of organisms belonging to the same species and capable of interbreeding.
PPA. See U.S. Department of Agriculture.
Prion. See Proteinaceous infectious particle.
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population A group of organisms of the same species inhabiting a specific geographical locality.
population crash A sudden population decline caused by predation, waste accumulation, or resource depletion; also called a dieback.
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Population a group of the same species of organism in the same area at the same time
(populus = the people)
Porphyria a dominant genetic inability to make porphyrin
(porphyr = purple; -ia = state of condition of disease) ...
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a population of a species that differs genetically from other populations of the same species because they have adapted to different environments. Source: user submission
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: In population genetics, the nonreciprocal interaction between
nonallelic
genes affecting the selective values of genes (see
Trojak ...
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Clonal
A population of cells derived from a single cell and thus expected to be genetically identical. Genetic differences in a "clonal" population may arise from random spontaneous mutations during growth of the cells.
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Testing a population group to identify a subset of individuals at high risk for having or transmitting a specific genetic disorder.
explained:
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The total dry weight of all organisms in a particular sample, population, or area. Bioremediation. The use of microorganisms to remedy environmental problems. See Bioaugmentation, Bioenrichment. Biotechnology.
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Genetic variation -- a phenotypic variance of a trait in a population attributed to genetic heterogeneity.
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Community: A group of populations of different species occupying a given place at a given time that are viewed as interdependent. An aggregation of interacting species.
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Large population oscillations Arctic
Arctic tundra is located in the northern hemisphere, encircling the north pole and extending south to the coniferous forests of the taiga. The arctic is known for its cold, desert-like conditions.
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DNA preparations of ten individuals of a population of hypothetical yum-yum trees were restricted, the products electrophoresed and Southern blotted. The blot was probed by hybridization with a cloned fragment of the tree's genome.
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Differential display A form of RT-PCR in which primers are used to select a subset of the total mRNA population. This allows comparison of mRNAs from different cells.
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The arrows indicate the preferred flow of a population on the landscape, and the points A, B, and C are local optima. The red ball indicates a population that moves from a very low fitness value to the top of a peak
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The organisms in a plant population and the biotic and abiotic factors which impact on them. Ecosystems can be narrowly defined or broadly defined (e.g. the basin big sagebrush ecosystem or the more general sagebrush ecosystem) ...
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control action threshold. Pest population level at which treatment is necessary to prevent economic loss, also called economic threshold.
cornicle. Two tubular structures located on the posterior part of an aphid's abdomen.
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Solution hybridization is designed to measure the levels of a specific mRNA species in a complex population of RNA.
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Allele
One of the alternative forms of a gene. Most genes in natural populations occur in more than one form.
Biogeography
The study of the geographic distributions of species and the historical explanation of these patterns.
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To be called a polymorphism, a variant should be present in a significant number of people in the population. Genetic variations occurring in more than 1% of a population would be considered useful polymorphisms for genetic linkage analysis.
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Single base differences of DNA sequences between individuals of a population. For PCR screening and detection of SNP, please visit Primo SNP. See also PCR Glossary.
Other Resources
PubMed Google ...
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Differs from polyclonal antibodies, which are mixed populations of antibody molecules such as may be present in a serum specimen, within which many different individual antibodies have different binding specificities.
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polymorphic Describing a protein for which amino acid sequence variants exist in a population of organisms, but the variations do not destroy the protein's function. For example, antibodies which contain variable and hypervariable sites.
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