reinforcement in chorus frogs: lifetime fitness
... ubiquity of reinforcement requires fitness to be estimated across the life cycle, but the literature is surprisingly depauperate of such studies. We present fitness estimates of laboratory-raised hybrids between the chorus frogs Pseudacris feriarum and Pseudacris nigrita—two species that have underg ...
... ubiquity of reinforcement requires fitness to be estimated across the life cycle, but the literature is surprisingly depauperate of such studies. We present fitness estimates of laboratory-raised hybrids between the chorus frogs Pseudacris feriarum and Pseudacris nigrita—two species that have underg ...
Species, Hybrids, and Natural Selection: The dynamics of
... The concept of evolution was not new to either Darwin of Wallace. Both Lamarck and Chambers had presented evidence supporting the phenomenon of evolution in books that were read widely by naturalists of the time (Lamarck’s Philosophie Zoologique and Chamber’s Vestiges of Creation). Both Lamarck and ...
... The concept of evolution was not new to either Darwin of Wallace. Both Lamarck and Chambers had presented evidence supporting the phenomenon of evolution in books that were read widely by naturalists of the time (Lamarck’s Philosophie Zoologique and Chamber’s Vestiges of Creation). Both Lamarck and ...
Distortion of symmetrical introgression in a hybrid zone
... introgress at different rates. Because mtDNA is assumed selectively neutral, it is generally believed to have greater rates of introgression than nuclear genes, but an equally parsimonious explanation is positive selection that sweeps the mitochondrial genome through the population (Dasmahapatra et ...
... introgress at different rates. Because mtDNA is assumed selectively neutral, it is generally believed to have greater rates of introgression than nuclear genes, but an equally parsimonious explanation is positive selection that sweeps the mitochondrial genome through the population (Dasmahapatra et ...
The speed of ecological speciation
... migrants than to the fitness of hybrids. One reason is that hybrids are often phenotypically intermediate between parental species, and will therefore be less maladapted than are migrants. Another reason is that reproductive barriers acting earlier (on migrants before they reproduce) make a greater ...
... migrants than to the fitness of hybrids. One reason is that hybrids are often phenotypically intermediate between parental species, and will therefore be less maladapted than are migrants. Another reason is that reproductive barriers acting earlier (on migrants before they reproduce) make a greater ...
The dimensions, modes and definitions of species and
... subjected to fluctuations unrelated to selection for reproductive isolation. In effect, reproductive isolation was a side-effect of evolution in small populations. The British tradition of Haldane and Maynard Smith, by contrast, tended to ignore speciation and focus mostly on selection and adaptation. ...
... subjected to fluctuations unrelated to selection for reproductive isolation. In effect, reproductive isolation was a side-effect of evolution in small populations. The British tradition of Haldane and Maynard Smith, by contrast, tended to ignore speciation and focus mostly on selection and adaptation. ...
intraspecific variation in sexual isolation in the
... populations that produce unfit hybrids (Dobzhansky 1940). A by-product of reinforcement is that sympatric populations will show stronger levels of mate discrimination than allopatric populations of the same taxa (Noor 1995; Saetre et al. 1997; Rundle and Schluter 1998). Alternatively, sexual selecti ...
... populations that produce unfit hybrids (Dobzhansky 1940). A by-product of reinforcement is that sympatric populations will show stronger levels of mate discrimination than allopatric populations of the same taxa (Noor 1995; Saetre et al. 1997; Rundle and Schluter 1998). Alternatively, sexual selecti ...
EVOLUTION AND SPECIATION
... the females produced the compounds in a specific ratios that never overlapped if the species were not isolated by other barriers. ...
... the females produced the compounds in a specific ratios that never overlapped if the species were not isolated by other barriers. ...
A View of Life
... species while geographically separated from its parent population. reproductive isolation occurs. Examples: squirrels on either side of the Grand Canyon; pupfish in springs in the deserts of California and Nevada; adaptive radiation in island chains. ...
... species while geographically separated from its parent population. reproductive isolation occurs. Examples: squirrels on either side of the Grand Canyon; pupfish in springs in the deserts of California and Nevada; adaptive radiation in island chains. ...
Mate-recognition and species boundaries in the ascomycetes
... of a single genomic locus. Mating occurs only between haploid individuals dissimilar at the MAT locus. The two alternative sequences at the MAT locus share no obvious homology and sometimes contain more than one gene. They are therefore referred to as “idiomorphs” rather than alleles (Metzenberg and ...
... of a single genomic locus. Mating occurs only between haploid individuals dissimilar at the MAT locus. The two alternative sequences at the MAT locus share no obvious homology and sometimes contain more than one gene. They are therefore referred to as “idiomorphs” rather than alleles (Metzenberg and ...
Integration of populations and differentiation of species
... Only a handful of genes have been identified that are known to contribute to reproductive isolation, and most of these are from animals. These ‘isolation genes’ can be divided into two groups, based on whether they contribute to pre or postzygotic isolation. Those involved in prezygotic isolation in ...
... Only a handful of genes have been identified that are known to contribute to reproductive isolation, and most of these are from animals. These ‘isolation genes’ can be divided into two groups, based on whether they contribute to pre or postzygotic isolation. Those involved in prezygotic isolation in ...
Here - Fred Hutchinson Cancer Research Center
... 1999; Rundle 2002) and sexual selection against hybrid males (Vamosi & Schluter 1999). In order to better understand the role of these forms of reproductive isolation in the divergence of the species pairs, as well as their influence on reinforcement (Rundle & Schluter 1998), the extent of gene flow ...
... 1999; Rundle 2002) and sexual selection against hybrid males (Vamosi & Schluter 1999). In order to better understand the role of these forms of reproductive isolation in the divergence of the species pairs, as well as their influence on reinforcement (Rundle & Schluter 1998), the extent of gene flow ...
Gene expression divergence and the origin of hybrid
... genes surveyed increased, decreased, or lost sex-biased expression. They also found that male-biased genes showed significantly greater divergence in expression than either female-biased or non-sex-biased genes. Complementary to this research, Meiklejohn et al. (2003) observed greater variation amon ...
... genes surveyed increased, decreased, or lost sex-biased expression. They also found that male-biased genes showed significantly greater divergence in expression than either female-biased or non-sex-biased genes. Complementary to this research, Meiklejohn et al. (2003) observed greater variation amon ...
Chapter 8: Evolution Lesson 8.4: Macroevolution and the Origin of
... place". So how do the populations diverge if they live in the same space? The most common cause for sympatric speciation is reproductive isolation. Reproductive isolation may be due to individuals coming into their mating seasons at different times or preference of where to find a mate. In many spec ...
... place". So how do the populations diverge if they live in the same space? The most common cause for sympatric speciation is reproductive isolation. Reproductive isolation may be due to individuals coming into their mating seasons at different times or preference of where to find a mate. In many spec ...
- Wiley Online Library
... by real new data, particularly from ecological and molecular studies of natural populations. All this philosophizing is a classic symptom of scienti®c revolutions: `it is, I think, particularly in times of acknowledged crisis [i.e. during scienti®c revolutions] that scientists have turned to philoso ...
... by real new data, particularly from ecological and molecular studies of natural populations. All this philosophizing is a classic symptom of scienti®c revolutions: `it is, I think, particularly in times of acknowledged crisis [i.e. during scienti®c revolutions] that scientists have turned to philoso ...
Recombination and the Divergence of Hybridizing
... species than rearranged regions because of incomplete linkage to alleles conferring adaptation, mating discrimination, or hybrid dysfunction. Rearranged regions may sometimes be completely linked to such alleles, and introgression will be more limited. These expectations have been demonstrated in em ...
... species than rearranged regions because of incomplete linkage to alleles conferring adaptation, mating discrimination, or hybrid dysfunction. Rearranged regions may sometimes be completely linked to such alleles, and introgression will be more limited. These expectations have been demonstrated in em ...
Cooley, J. R., C. Simon, and D. C. Marshall. 2003
... created new opportunities for contact between the previously separated M. septendecim/M. neotredecim lineage and the M. tredecim lineage. What were the results of this natural experiment? Instead of forming a hybrid zone, the interacting populations appear to have maintained their distinctiveness, a ...
... created new opportunities for contact between the previously separated M. septendecim/M. neotredecim lineage and the M. tredecim lineage. What were the results of this natural experiment? Instead of forming a hybrid zone, the interacting populations appear to have maintained their distinctiveness, a ...
Natural Selection and Parallel Speciation in Sympatric Sticklebacks
... lakes (for instance, Benthics from Priest, Paxton, and Enos Lakes) should not be reproductively isolated from one another despite the known reproductive isolation between different ecomorphs within lakes (15). Second, reproductive isolation should exist between ecomorphs from different lakes (for in ...
... lakes (for instance, Benthics from Priest, Paxton, and Enos Lakes) should not be reproductively isolated from one another despite the known reproductive isolation between different ecomorphs within lakes (15). Second, reproductive isolation should exist between ecomorphs from different lakes (for in ...
Lesson Overview
... separate species. Reproductive isolation can develop in a variety of ways, including behavioral isolation, geographic isolation, and temporal isolation. ...
... separate species. Reproductive isolation can develop in a variety of ways, including behavioral isolation, geographic isolation, and temporal isolation. ...
Lesson Overview
... separate species. Reproductive isolation can develop in a variety of ways, including behavioral isolation, geographic isolation, and temporal isolation. ...
... separate species. Reproductive isolation can develop in a variety of ways, including behavioral isolation, geographic isolation, and temporal isolation. ...
Distribution and reproductive effects of Wolbachia i n stalk-eyed flies
... their hosts in a manner which increases their spread within a population. These microbes can cause cytoplasmic incompatibility, parthenogenesis and feminization of genetic males. Because Wolbachia have been associated with female-biased sex ratio distortion, we used a PCR assay to examine 17 species ...
... their hosts in a manner which increases their spread within a population. These microbes can cause cytoplasmic incompatibility, parthenogenesis and feminization of genetic males. Because Wolbachia have been associated with female-biased sex ratio distortion, we used a PCR assay to examine 17 species ...
Outline
... Allopatric speciation of antelope squirrels on opposite rims of the Grand Canyon. Birds and other organisms that can disperse across the Grand Canyon have not diverged into different species on opposite rims. ...
... Allopatric speciation of antelope squirrels on opposite rims of the Grand Canyon. Birds and other organisms that can disperse across the Grand Canyon have not diverged into different species on opposite rims. ...
14. The Origin of the Species
... reproductive barriers can evolve as a byproduct of the adaptive divergence of populations in different environments – Fruit flies bred for several generations on a certain food tended to choose mates that ...
... reproductive barriers can evolve as a byproduct of the adaptive divergence of populations in different environments – Fruit flies bred for several generations on a certain food tended to choose mates that ...
Speciation
... • Fitness depends on the combined action of the ‘right’ alleles at both loci • Idea supported by genetic data showing that reproductive isolation is based on epistatic interactions among several or many loci ...
... • Fitness depends on the combined action of the ‘right’ alleles at both loci • Idea supported by genetic data showing that reproductive isolation is based on epistatic interactions among several or many loci ...
LEH Evolution.tst
... individuals mate randomly, and there is no natural selection on wing color. How will p, the frequency of the dominant allele, change over time? A) p will decrease because of genetic drift. B) p will increase; the dominant allele will eventually take over and become most common in the population. C) ...
... individuals mate randomly, and there is no natural selection on wing color. How will p, the frequency of the dominant allele, change over time? A) p will decrease because of genetic drift. B) p will increase; the dominant allele will eventually take over and become most common in the population. C) ...