Estimates of DNA and Protein Sequence Divergence: An
... Templeton et al. 1981) that the effects of the initial conditions on estimates of divergence are usually ignored. These initial conditions include whether the original population is polymorphic and to what extent. Templeton et al. (1981) show that for several species sufficient polymorphism exists t ...
... Templeton et al. 1981) that the effects of the initial conditions on estimates of divergence are usually ignored. These initial conditions include whether the original population is polymorphic and to what extent. Templeton et al. (1981) show that for several species sufficient polymorphism exists t ...
Phytophthora Dieback – detecting the pathogen
... P. cinnamomi is already widespread in WA’s south-west, especially where annual rainfall exceeds 600mm, but every effort must be made to protect non-infested sites that are considered “protectable”, especially where endangered species of flora or fauna, or threatened ecological communities, are prese ...
... P. cinnamomi is already widespread in WA’s south-west, especially where annual rainfall exceeds 600mm, but every effort must be made to protect non-infested sites that are considered “protectable”, especially where endangered species of flora or fauna, or threatened ecological communities, are prese ...
Biodiversity
... One could look at the radiation of species or other taxa from a single ancestor. One could consider the diversity within a selected taxon over time. One could consider the total number of species that have ever existed. ...
... One could look at the radiation of species or other taxa from a single ancestor. One could consider the diversity within a selected taxon over time. One could consider the total number of species that have ever existed. ...
16.2 How Is Reproductive Isolation Between Species Maintained?
... Traits that prevent interbreeding and maintain reproductive isolation are called isolating mechanisms Mechanisms that prevent mating between species are called premating isolating mechanisms Mechanisms that prevent formation of vigorous, fertile hybrids between species are called postmating is ...
... Traits that prevent interbreeding and maintain reproductive isolation are called isolating mechanisms Mechanisms that prevent mating between species are called premating isolating mechanisms Mechanisms that prevent formation of vigorous, fertile hybrids between species are called postmating is ...
16.2 How Is Reproductive Isolation Between Species Maintained?
... Traits that prevent interbreeding and maintain reproductive isolation are called isolating mechanisms Mechanisms that prevent mating between species are called premating isolating mechanisms Mechanisms that prevent formation of vigorous, fertile hybrids between species are called postmating is ...
... Traits that prevent interbreeding and maintain reproductive isolation are called isolating mechanisms Mechanisms that prevent mating between species are called premating isolating mechanisms Mechanisms that prevent formation of vigorous, fertile hybrids between species are called postmating is ...
The genetics of species differences
... known with precision8, uncover the fewest factors. Similarly, in several cases in which few factors were found, for example, carotenoid concentration in Mimulus13, detected QTL explain essentially all of the F2 phenotypic variance, suggesting that few factors of substantial effect were missed. Final ...
... known with precision8, uncover the fewest factors. Similarly, in several cases in which few factors were found, for example, carotenoid concentration in Mimulus13, detected QTL explain essentially all of the F2 phenotypic variance, suggesting that few factors of substantial effect were missed. Final ...
File - Cook Biology
... grouping organisms. • The biological species concept states that a species is a group of populations whose members have the potential to interbreed in nature and produce viable, fertile offspring; they do not breed successfully with other populations. ...
... grouping organisms. • The biological species concept states that a species is a group of populations whose members have the potential to interbreed in nature and produce viable, fertile offspring; they do not breed successfully with other populations. ...
Figure 2. A pedigree for a half
... of non-existent alleles. The Hardy-Weinberg laws rarely holds true in nature (otherwise evolution would not occur). Organisms are subject to mutations, selective forces and they move about, or the allele frequencies may be different in males and females. The gene frequencies are constantly changing ...
... of non-existent alleles. The Hardy-Weinberg laws rarely holds true in nature (otherwise evolution would not occur). Organisms are subject to mutations, selective forces and they move about, or the allele frequencies may be different in males and females. The gene frequencies are constantly changing ...
`biodiversity`?
... One could look at the radiation of species or other taxa from a single ancestor. One could consider the diversity within a selected taxon over time. One could consider the total number of species that have ever existed. ...
... One could look at the radiation of species or other taxa from a single ancestor. One could consider the diversity within a selected taxon over time. One could consider the total number of species that have ever existed. ...
paper
... A commonly held view in evolutionary biology is that speciation (the emergence of genetically distinct and reproductively incompatible subpopulations) is driven by external environmental constraints, such as localized barriers to dispersal or habitat-based variation in selection pressures. We have d ...
... A commonly held view in evolutionary biology is that speciation (the emergence of genetically distinct and reproductively incompatible subpopulations) is driven by external environmental constraints, such as localized barriers to dispersal or habitat-based variation in selection pressures. We have d ...
Evolution of Allometry in Antirrhinum
... PCA revealed that 97% of the variance in organ shape and size could be accounted for by six PCs. These PCs are given the subscript spp as they describe variation between species and are ranked according to the amount of variation they explain (with PC1 ranking highest). The variation in leaf and pet ...
... PCA revealed that 97% of the variance in organ shape and size could be accounted for by six PCs. These PCs are given the subscript spp as they describe variation between species and are ranked according to the amount of variation they explain (with PC1 ranking highest). The variation in leaf and pet ...
Old
... Results of the t-test: If the p-value associated with the t-test is small (usually set at p < 0.05), there is evidence to reject the null hypothesis in favor of the alternative. In other words, there is evidence that the mean is significantly different than the hypothesized value. If the p-value ass ...
... Results of the t-test: If the p-value associated with the t-test is small (usually set at p < 0.05), there is evidence to reject the null hypothesis in favor of the alternative. In other words, there is evidence that the mean is significantly different than the hypothesized value. If the p-value ass ...
Speciation factsheet
... the other. The unique characteristics of the smaller group are passed on to offpsring, making these characteristics more common in this group. Parapatric speciation - In some cases, a species is spread out over a large geographic area and although it is possible for any member of the species to mate ...
... the other. The unique characteristics of the smaller group are passed on to offpsring, making these characteristics more common in this group. Parapatric speciation - In some cases, a species is spread out over a large geographic area and although it is possible for any member of the species to mate ...
Does Speciation between Arabidopsis halleri and
... lyrata has a circumboreal distribution but also occurs in Western and Central Europe [10]. The two species differ in an important ecological trait. A. halleri is a pseudometallophyte species able to colonize soils highly enriched in zinc and cadmium, and can accumulate these metals in its aerial par ...
... lyrata has a circumboreal distribution but also occurs in Western and Central Europe [10]. The two species differ in an important ecological trait. A. halleri is a pseudometallophyte species able to colonize soils highly enriched in zinc and cadmium, and can accumulate these metals in its aerial par ...
Species, Historicity, and Path Dependency
... reproductive isolating mechanisms that prevent them from interbreeding and producing fertile offspring with the members of its parental species. Reproductive isolating mechanisms come in two forms. Pre-zygotic mechanisms, such as incompatible sexual physiologies, prevent members of different species ...
... reproductive isolating mechanisms that prevent them from interbreeding and producing fertile offspring with the members of its parental species. Reproductive isolating mechanisms come in two forms. Pre-zygotic mechanisms, such as incompatible sexual physiologies, prevent members of different species ...
Species distribution
Species distribution is the manner in which a biological taxon is spatially arranged. Species distribution is not to be confused with dispersal, which is the movement of individuals away from their area of origin or from centers of high population density. A similar concept is the species range. A species range is often represented with a species range map. Biogeographers try to understand the factors determining a species' distribution. The pattern of distribution is not permanent for each species. Distribution patterns can change seasonally, in response to the availability of resources, and also depending on the scale at which they are viewed. Dispersion usually takes place at the time of reproduction. Populations within a species are translocated through many methods, including dispersal by people, wind, water and animals. Humans are one of the largest distributors due to the current trends in globalization and the expanse of the transportation industry. For example, large tankers often fill their ballasts with water at one port and empty them in another, causing a wider distribution of aquatic species.Biogeography is the study of the distribution of biodiversity over space and time. It is very useful in understanding species distribution through factors such as speciation, extinction, continental drift, glaciation, variation of sea levels, river capture and available resources. This branch of study not only gives a description of the species distribution, but also a geographical explanation for the distribution of particular species. The traditional biogeographic regions were first modeled by Alfred Wallace in The Geographical Distribution of Animals (1876). These were based on the work of Sclater's terrestrial biogeographic regions. Wallace's system was based on both birds and vertebrates, including non-flying mammals, which better reflect the natural divisions of the Earth due to their limited dispersal abilities.