Divergence With Genetic Exchange

Author: Michael L. Arnold
Publisher: Oxford University Press
ISBN: 0191038911
Size: 53.81 MB
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This research level text is suitable for senior undergraduate and graduate level students taking related courses in departments of genetics, ecology and evolution.

Evolution Through Genetic Exchange

Author: Michael L Arnold
Publisher: Oxford University Press
ISBN: 0198570066
Size: 72.53 MB
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In this book, Arnold promotes the 'web-of-life' metaphor as a more appropriate representation of evolutionary change in all lifeforms.

How And Why Species Multiply

Author: Peter R. Grant
Publisher: Princeton University Press
ISBN: 9780691133607
Size: 65.79 MB
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The second stage is dominated by genetic divergence. It starts with the origin of
genetic incompatibilities between hybridizing species. The potential to exchange
genes through intro- gressive hybridization diminishes, with fertility of hybrids
declining earlier than viability, and female hybrids exhibiting reduced fitness
earlier than male hybrids. The third and final stage begins with complete
cessation of gene exchange between at least two of the species in a radiation. In
birds this point is ...

Genomes And Genomics Of Nitrogen Fixing Organisms

Author: Rafael Palacios
Publisher: Springer Science & Business Media
ISBN: 1402030541
Size: 50.96 MB
Format: PDF, ePub, Mobi
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He also indicated that the role of genetic exchange among bacterial species is
markedly different than its role among eukaryotic species, in that bacterial genetic
exchange does not significantly hinder adaptive divergence. Consequently, he
suggested that there is no justification for classifying bacteria solely on the basis
of patterns of recombination. 11. A PROPOSED UNIFIED SPECIES CONCEPT
FOR BACTERIA Lawrence (2001) has proposed a Unified Species Concept (
USC) for ...

Tropical Rainforests

Author: Eldredge Bermingham
Publisher: University of Chicago Press
ISBN: 0226044688
Size: 42.81 MB
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However, explanationsofexactlyhow theymightbe important, and speci>cdata on
the evolutionaryprocessesre- sponsible, have been lacking. Over the lastdecade,
the divergence-with-gene-?ow modelofspe- ciation has received strong support
from laboratory studies of Drosophila. Studies show that if populations are
experiencing strong divergent selection, they may diverge and become repro-
ductively isolated even if some genetic exchange occurs between them. Using
one ofthe ...

A Community Genomics Investigation Of Microorganisms Involved In Acid Mine Generation

Author: Gene William Tyson
Size: 18.11 MB
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For each clone showing intra- or inter- species genetic exchange, we estimated
the nucleotide sequence divergence between the parental groups.
Recombination frequencies were calculated for intervals of 1% sequence
divergence and plotted in order to evaluate the relationship between sequence
divergence and genetic exchange (Figure 5). Within population frequencies for
both Ferroplasma species showed a clear log-linear relationship with sequence
divergence (R* > 0.95).

Reticulate Evolution And Humans

Author: Michael L. Arnold
Publisher: OUP Oxford
ISBN: 0191561614
Size: 52.61 MB
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However, resistance to our species' inclusion in the category of organisms
impacted by genetic exchange during divergence has been strong. The words of
Jolly (2001) reflect well one of the conclusions that can be drawn from the data
presented in this and the next chapter concerning the implications of the
reticulate evolution within “our” clade: “it is important to stress that if we reduce
recognizable 'forms' of Homo. . . to subspecific status because of the possibility of
some marginal ...

Evolution Of Wild Emmer And Wheat Improvement

Author: E. Nevo
Publisher: Springer Science & Business Media
ISBN: 9783540417507
Size: 77.68 MB
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The evidence described above was derived from our three microgeographic tests
and leads us to believe that natural selection, in its diverse forms, primarily
diversifying selection following the Levene (1953) model, plays an important role
in SSR, RAPD, and allozyme microecological divergence, as reflected by the
niche-specific and niche-unique alleles of these genetic systems. No
evolutionary force other than natural selection seems able to generate the
genetic divergence found ...

Genetics And Evolution Of Aquatic Organisms

Author: A. Beaumont
Publisher: Springer Science & Business Media
ISBN: 9780412493706
Size: 41.14 MB
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J. and Berg, O.K. (1989) Genetic divergence of anadromous and
nonanadromous Atlantic salmon (Salmo salar) in the river Namsen, Norway. Can
. J. Fish. Aquat. ... This is despite the strong flow of the South Equatorial Current
from the eastern islands over a number of isolated reefs in the middle of the Coral
Sea towards the GBR, It is suggested that these patterns of genetic differentiation
reflect past episodes of genetic exchange rather than present-day gene flow. 1.6.
1 Introduction ...

Ecological Speciation

Author: Patrik Nosil
Publisher: OUP Oxford
ISBN: 0191628026
Size: 48.87 MB
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For example, the concept that natural selection against immigrants into foreign
environments (i.e., “immigrant inviability”) can reduce interbreeding between
populations, and thus act as a barrier to genetic exchange, unifies the study of
divergent adaptation and speciation (Nosil et al. 2005). The concept of “genomic
islands of divergence” is a useful metaphor for considering how the diversifying
effects of selection spread throughout the genome during the speciation process
(Turner et ...