The phyletic graduallsm model OT speciation asserts that; Most speciation occurs allopatrically O Speciation is a slow and gradual process that occurs as species slowly become geographically separated speciation occurs in quickly and then is followed by periods with little if any change Most speciation occurs sympatrially

The phyletic graduallsm model OT speciation asserts that; Most speciation occurs allopatrically O Speciation is a slow and gradual process that occurs as species slowly become geographically separated speciation occurs in quickly and then is followed by periods with little if any change Most speciation occurs sympatrially

Biology (MindTap Course List)

11th Edition

ISBN:9781337392938

Author:Eldra Solomon, Charles Martin, Diana W. Martin, Linda R. Berg

Publisher:Eldra Solomon, Charles Martin, Diana W. Martin, Linda R. Berg

Chapter20: Speciation And Macroevolution

Section: Chapter Questions

Problem 4TYU: The first step leading to allopatric speciation is (a) hybrid inviability (b) hybrid breakdown (c)...

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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 above
Indicate 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 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.
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 speciation
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
What are the most common mechanisms of sympatric speciation and in which major group of organisms does this happen most often? Disti nguish between sympatric and allopatric and parapat r ic speciation. Which is considered the (far) more common mechanism of species formation? What does "gene flow" between populations do?
In comparative studies, it is important to be aware of relationships among species because a trait that appears in several closely related species is probably an adaptation it is not necessary to have large sample sizes if the species are closely related testing related species is more powerful than testing randomly chosen species experimental conclusions are statistically more powerful when data points are not independent of each other data points should be independent, and two related species might have derived their trait from a shared ancestor, rather than each having evolved it independently
The biological species concept depends on the existence of barriers to reproduction. What are they? Does this species concept apply in all situations? Think of an example from nature where the biological species concept would NOT be that applicable. Which species concept would be better in this example? How does speciation occur? What environmental factors might contribute to speciation? Can an individual speciate? Use terminology for the two kinds of speciation we have learned about. What is “gene flow”? What does it mean if there is NO gene flow? Two groups of individuals are separated by either side of a canyon. One researcher found that they do not cross the canyon at any point. The group on the north side have fluffy tails and thicker coats, and they do not eat moss. The south side individuals eat moss almost exclusively, have a thin coat and tail, but otherwise are generally identical. When in the lab they mated successfully, and the offspring of that mating also mated…
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 selection
Explain the difference in behaviors of temporally isolated species when it comes to Allopatric vs Sympatric speciation.
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.
What are the most common mechanisms of symptoms speciation and in which major ground of organisms does this happen most often? Distinguish between sympatric and allopatric and parapatric speciation. What is considered the (far) more common mechanism of species formation? What does "gene flow " between populations do?