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Population dynamics is the branch of life sciences that studies short-term and long-term changes in the size and age composition of populations, ...
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.
Population genetics is the study of the allele frequency distribution and change under the influence of the four evolutionary forces: natural selection, genetic drift, mutation and gene flow.
dynamics is the study of marginal and long-term changes in the numbers, individual weights and age composition of individuals in one or several s, and biological and environmental processes influencing those changes.
Population: A group of organisms, all of the same species, which occupies a particular area. Also, the total number of individuals of a species within an ecosystem, or of any group of similar individuals.
More Biology Terms ...
ecology is the study of s and their interactions with the environment. A is a group of individuals of a species in a particular area.
1. people inhabiting a territory, as in American population ...
Part of the work of forensic DNA analysis is the creation of databases for the STR loci studied.
Population changes can be studied using population graphs:
This is an exponential growth curve. This type of curve occurs when a population grows in size under ideal conditions.
genomics is the application of genomic technologies to understand s of organisms.
Some populations go through repeated and regular periods of boom followed by bust.
A 's gene pool is defined by its allele frequencies.
A is a localized group of individuals that belong to the same species.
A population must be large enough that chance occurrences cannot significantly change allelic frequencies significantly. To better understand this point, consider the random flipping of a fair coin.
No more growth, size is constant.
Natality rate is equal to mortality rate.
The has reached the carrying capacity of the environment.
Students of population genetics learn from their textbooks that levels of genetic diversity are determined by the rate of mutation (the number of new mutations per nucleotide site and generation) and the number of reproducing individuals in the ...
The sum of the fitnesses of the genotypes of a weighted by their proportions; hence a weighted mean fitness.
Populations Transition Between Growth and Stability
Limits on population growth can include food supply, space, and complex interactions with other physical and biological factors (including other species).
s of living things evolve
Evolution refers to changes in the genetic composition of a . Genetic changes may result in changes in the physical or behavioral characteristics of the individuals.
Population: A group of individuals of the same species within a given space and time.
Predaceous: Preying upon other organisms, predatory.
Type of genetic drift that occurs as the result of a being drastically reduced in numbers by an event having little to do with the usual forces of natural selection.
population dynamics The study of the factors that affect the growth, stability, and decline of populations, as well as the interactions of those factors.
an interbreeding group of individuals of one species occupying a defined geographic area.
predation a relationship in which one within a community may capture and feed upon another .
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.
: The number of individuals of a particular species that live within a defined area.
Predator: An animal that hunts and kills other animals for food.
Prey: An animal that is used by other animals for food.
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) ...
The study of variation in genes among a group of individuals.
Positional cloning ...
8. A population of an organism reaches steady state; which would most likely have the biggest impact on population density?
s evolve. [evolution: a change in the gene pool] In order to understand evolution, it is necessary to view s as a collection of individuals, each harboring a different set of traits.
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.
s or species with low genetic diversity at many genes are at risk. When diversity is very low, all the individuals are nearly identical.
A group of organisms of the same species relatively isolated from other groups of the same species. See deme.
of transgenic salmon have been produced in which individuals grow rapidly
These transgenic fish could compete for food with other fish species
Cells & Molecules
Cell Division ...
Population density. Number of individuals per unit area or volume
Porifera. The phylum comprising the sponges.
See also: Organ, Human, Trans, Biology, Species