deme, in biology, a population of organisms within which the exchange of genes is completely random; i.e., all mating combinations between individuals of opposite sexes have the same probability of occurrence.
What is deme example?
It is to such clusters that the term deme is usually applied. Thus, the green frogs in an isolated pond, a town of prairie dogs, or a field of wild sunflowers might be examples of demes.
What does it mean deme?
Definition of deme 1 : a unit of local government in ancient Attica. 2 : a local population of closely related interbreeding organisms.
What is a deme in anthropology?
A deme is a sub-population (a smaller group within the population) that can freely interbreed. A population is usually made of several demes (groups) that are partially isolated from each other. Often a geographical barrier limits gene flow between demes, but not sufficiently to result in speciation.
What is a deme quizlet?
Deme: A local, usually stable population of interbreeding organisms of the same kind or species.
How many demes were there?
There were about 150 demes in the 5th century bc and more than 170 later. A typical deme had three bouletai, but the largest had as many as 22.
What is demes and dispersal in ecology?
Demes (little circles) are organized on a two dimensional grid, over two habitats (white demes and black demes). Dispersal between demes follows a pattern of isolation by distance and occurs at the juvenile stage, after selection.
What are Polytypic species?
polytypic. [ pŏl′ē-tĭp′ĭk ] Having several variant forms, especially containing more than one taxonomic category of the next lower rank. A polytypic genus contains two or more different species, while a polytypic species consists of two or more subspecies.
What is deme and cline?
Enough gene flow occurs between demes ensuring that all of its members remain the same species. Example: Adivasis are a smaller group within a population of human beings. A cline is the gradual change in the phenotypes and genotypes of a species across a geographical gradient.
What did demes create?
Demes were combined within the same area to make trittyes, larger population groups, which in turn were combined to form the ten tribes, or phylai of Athens. Each tribe contained one trittys from each of three regions: the city, the coast, and the inland area.
What were the demes in Constantinople?
The Demes were the factions of the chariot races. There were two demes, the Blues and Greens. The demes were essentially sports clubs, but the demes also had a place in politics. Justinian himself was a major supporter of the blues.
What is Interpopulation variation?
Interpopulation variance can be used to quantify the range of exposure in ecological studies and to examine the heterogeneity of study populations pooled for individual-based investigations, in order to facilitate the interpretation of studies using data from multiple populations.
What is meant by gene pool?
A gene pool refers to the combination of all the genes (including alleles) present in a reproducing population or species. A large gene pool has extensive genomic diversity and is better able to withstand environmental challenges.
Can Ring species interbreed?
In a ring species, gene flow occurs between neighbouring populations of a species, but at the ends of the “ring”, the populations don’t interbreed.
What is the difference between a deme and a subspecies?
A deme is a single population, while a subspecies may include multiple populations.
What is the most precise definition of the term jihad quizlet?
What is the most precise definition of the term jihad? struggle.
Who first created democracy?
In the year 507 B.C., the Athenian leader Cleisthenes introduced a system of political reforms that he called demokratia, or “rule by the people” (from demos, “the people,” and kratos, or “power”). It was the first known democracy in the world.
Who betrayed Sparta?
In the 1962 film The 300 Spartans, Ephialtes was portrayed by Kieron Moore and is depicted as a loner who worked on a goat farm near Thermopylae. He betrays the Spartans to the Persians out of greed for riches, and, it is implied, unrequited love for a Spartan girl named Ellas.
Where is Alopece today?
Alopece was situated only eleven or twelve stadia from the city, and not far from Cynosarges. It possessed a temple of Aphrodite, and also apparently one of Hermaphroditus. The location of Alopece is near current day Katsipodi.
What are the three types of dispersal?
- Jump Dispersal.
- Secular Migration.
What is the difference between dispersal and dispersion?
Dispersion is the result of dispersal, the movement of individuals from one place to another. As Udvardy (1969:10) made clear, “this dispersal move- ment … is the vehicle of the spacing pro- cess whereby even dispersion is brought about.” Dispersal is a process; dispersion is a state, a pattern.
What is the difference between dispersal and vicariance?
Dispersal occurs when a few members of a species move to a new geographical area, while vicariance occurs when a natural situation arises to physically divide organisms. Scientists have documented numerous cases of allopatric speciation.
Are humans a Polytypic species?
Humans are a polytypic species, meaning they are composed of populations that differ in the expression of one or more traits. There is a great deal of genotypic and phenotypic variation between individuals.
Are humans monotypic?
Yes, humans are considered monotypic. For example, all human beings have the same binomial name Homo sapiens regardless of the race or ethnicity. In other words, humans do not have subspecies as there isn’t much genetic variation.
What does Polytypic mean?
Definition of polytypic : represented by several or many types or subdivisions a polytypic species of organism.