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size and the size of the genetic pool

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contributing some of their nuclear DNA to the human gene pool

A species is a reproductively isolated population that shares a common gene pool and a common niche. This definition defines a species reproductively, genetically, and ecologically.

of a riffle-pool-riffle sequence in a ..

Neanderthals inhabited a vast geographical area extending from Portugal to western Siberia and from northern Europe to the Middle East until approximately 25,000 years ago (3). Recent evidence from DNA extracted from fossil Neanderthal bones reveals geneflow between Neanderthals and anatomically modern humans in the Middle East around 80,000 to 50,000 years ago as humans spread out of Africa and into Europe and Asia (4). Despite morphological and ontogenetic differences to humans (5-8), it appears that Neanderthals did not become extinct without first contributing some of their nuclear DNA to the human gene pool. Indeed, there was chronological overlap and coexistence between Neanderthals and humans (9,10), and hybrid specimens have been found that feature both Neanderthal and modern human features (11-15). It appears that many centuries of hybridization led to mosaic fossils with human cranial and dental features mixed with Neanderthal body proportions.

first locally adapted species can have their gene pool diluted by ..

particular allele within a population’s gene pool, ..

Local species richness–productivity. The species-pool hypothesis was inherently contained in Grime’s original explanation of low species richness. Latitude, productivity and species richness Len N. Gillman1, Shane D. Wright2. Competitive exclusion hypothesis, energy–richness hypothesis, forests, A Weld experiment testing the more individuals hypothesis for richness–productivity relationships. lates that productivity increases species richness by increas-

defines two organisms as conspecific if and only if they have the same number of and, for each chromosome, both organisms have the same number of (, p. 118). However, most if not all would strongly disagree. For example, in many , most notably in New Zealand's frogs, the genome consists of "core" chromosomes which are mostly invariable and accessory chromosomes, of which exist a number of possible combinations. Even though the chromosome numbers are highly variable between populations, these can interbreed successfully and form a single evolutionary unit. In plants, is extremely commonplace with few restrictions on interbreeding; as individuals with an odd number of chromosome sets are usually sterile, depending on the actual number of chromosome sets present, this results in the odd situation where some individuals of the same evolutionary unit can interbreed with certain others and some cannot, with all populations being eventually linked as to form a common gene pool.

repeatedly dipped into a pool of semen in ..

or more forms within a species’ gene pool.

in every stream and pool, in the air he ..
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    19/11/2012 · Because two people does not provide a broad enough genetic pool to create a viable species

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