Select the reasons why sympatric speciation is difficult to find or document. | Diverging species occupy the same geographic location. Diverging species are in a range large enough to cause their physical separation. Geographic barriers partially isolate some populations from others. | Gene flow among diverging groups continues, despite some nonrandom mating.
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- Which of the following statements about sympatric speciation is correct? It is a process through which two populations can diverge and develop reproductive isolation while in two different geographic area. It is the most common mechanism for populations to form independent species. Postzygotic isolation is the main form of reproductive isolation for the sympatric speciation process. Genetic isolation through large scale chromosomal mutations, such as chromosome inversion or polyploidy, are more likely contributing to sympatric speciation. None of the aboveIndicate the order in which the following steps would take place to result in Sympatric Speciation [enter 1 for the first step, 2 for the second, etc; write only the number -- no words, no spaces] As they adapt to their specific environments, the fitness of any hybrid formed is reduced. Reproductive isolating mechanisms are selected for so that less fit hybrids are not formed. Two species now exist. Interbreeding populations connected via gene flow occur across a range. The populations in the new environment adapt to their particular circumstances while the remainder stay as they were. Something happens so that some members of the populations/species change their environment (shift hosts; have a genetic change like polyploidy or inversions), so that they are separated from the others even thought hey are living in the same area.What are characteristics of sympatric speciation? Select all that apply. Reproductive isolation necessary to end gene flow Divergence within a population leads to speciation Absence of a physical barrier Presence of a physical barrier Reproductive isolation unnecessary to end gene flow
- Which of the following speciation mechanisms is most likely to be responsible for the divergence of a single species into two distinct species due to geographic isolation caused by a mountain range? Sympatric speciation Allopatric speciation (dispersal) Allopatric speciation (vicariance) Parapatric speciationIndicate the order in which the following steps would take place to result in Allopatric Speciation [enter 1 for the first step, 2 for the second, etc; write only the number -- no words, no spaces] The two groups develop reproductive isolating mechanisms so that they no longer interbreed. Interbreeding populations connected via gene flow occur across a range. The two separate groups adapt to their new environments. Some sort of physical barrier develops to split the once contiguous population(s) into two separate groups If they come back together, any hybrids formed are less fit.Indicate the order in which the following steps would take place to result in Parapatric Speciation [enter 1 for the first step, 2 for the second, etc; write only the number -- no words, no spaces] Something happens so that the environment is different in one part of the range relative to the other, even though the populations are still contiguous. As they adapt to their specific environments, the fitness of any hybrid formed is reduced. The populations adapt to their environment in the part of the range where they live. Interbreeding populations connected via gene flow occur across a range. Reproductive isolating mechanisms are selected for so that less fit hybrids are not formed. Two species now exist.
- Which of these options is NOT an example of a hypothesis that supports the occurrence of ecological speciation: ecologically divergent pairs of populations should be more reproductively isolated from one another than more ecologically similar pairs of populations traits that lead to divergent adaptations between populations should lead to reproductive isolation between those populations as well levels of gene flow between ecologically divergent populations should decrease as populations become more ecologically divergent ecologically divergent populations should differ in use of signals that relate to mate selectionWhen taxonomists recognize subspecies, they are identifying: populations with restricted enough gene flow to develop some population-specific traits, but that can still interbreed with members of other such populations. None of the other answer options is correct. populations that are reproductively isolated from one another. populations with extremely restricted gene flow due to allopatric isolation. O populations that will inevitably become separate species as reproductive isolation is nearly complete.Of the following species concept, which one emphasizes reproductive isolation as the major cause for speciation? Phylogenetic species concept Morphological species concept Biological species concept Evolutionary species concept
- A ring species is composed by populations arranged in a circle around a barrier with one boundary characterized by reproductive isolation. It is an example of: ORIGINAL POPULATION GENE FLOW FAILURE TO REPRODUCE GEOGRAPHIC BARRIER Allopatric speciation Sympatric speciation Ecological speciation Isolation by distanceWhich of the following is NOT necessary for speciation to take place? Genetic divergence Physical separation by a geographic barrier Separation in space or time Reproductive isolationAgrostis tenuis grasses tolerant of zinc metals in the soil (after evolving from metal-sensitive grasses near mine soils contaminated with zinc over the past 100 years), is an example of: allopatric speciation by vicariance allopatric speciation by dispersal peripatric speciation parapatric speciationE. sympatric speciation