Scientists observe two distinct group of anole lizards living in the same forest. Genetic analysis revealed that the two groups are very closely related and occasionally produce fertile hybrids. The two groups are nonetheless considered different species. One species is large and occupies the trunk of trees,rand mainly feeds on beetles. The other species is small, occupies the canopy and mainly feeds on flies. What mechanism most likely contributed to speciation in this case? Mechanical isolation Allopatric isolation Gametic isolation O Hybrid unviability OHabitat isolation

Scientists observe two distinct group of anole lizards living in the same forest. Genetic analysis revealed that the two groups are very closely related and occasionally produce fertile hybrids. The two groups are nonetheless considered different species. One species is large and occupies the trunk of trees,rand mainly feeds on beetles. The other species is small, occupies the canopy and mainly feeds on flies. What mechanism most likely contributed to speciation in this case? Mechanical isolation Allopatric isolation Gametic isolation O Hybrid unviability OHabitat isolation

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 6TYU: Which of the following evolutionary processes is associated with allopolyploidy? (a) gradualism (b)...

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A) Differentiate allopatric speciation and sympatricspeciation. Which type of speciation is more common andwhy? B) Is allopatric speciation more likely to occur inDumaran Island close to the main island of Palawan oron a more isolated island which is Culion Island of almostthe same size? Explain your prediction.
Sympatric speciation by allotetraploidy has been proposed as acommon mechanism for speciation. Let’s suppose you were interestedin the origin of certain grass species in southern California.Experimentally, how would you go about determining if some ofthe grass species are the result of allotetraploidy?
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.
Choose the best cause and effect sequence for the process of speciation by natural selection. One plant species blooms in June-July, and a second plant species blooms in August-September. One plant species is pollinated by bees and a second plant species is pollinated by moths. Two plant species live on the same mountainside, but one lives on rocky outcrops and the other in open meadows. O Two plant species have inghmpatible gametes.
Is allopatric speciation more likely to occur on an island close to the mainland or on a more isolated island of the same size? Justify your prediction.
Is speciation something that happened only in the distant past, or arenew species continuing to arise today? Explain.
What is the difference between parapatric speciation and sympatric speciation?I understand that it has to do with habitat but I am having trouble conceptualizing the differences. A simplistic analogy or metaphor to help understand the differences would be very appreciated as I am a disabled student. Thank You.
Which of the following factors would not contribute toallopatric speciation?(A) The separated population is small, and genetic drift occurs.(B) The isolated population is exposed to different selectionpressures than the ancestral population.(C) Different mutations begin to distinguish the gene pools ofthe separated populations.(D) Gene flow between the two populations is extensive.
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…
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.
For which of these groups is the biological species concept not useful for determining species? Mark all that apply. O Separate recognized species that form hybrids (many plant species) Nonsexual groups Extinct groups (fossils) O Species with many remote, isolated populations (vernal pools) O Two sympatric species that do not form hybrids O An introduced species that forms a hydrid with a native species
Speciation is shown in the Phylogenetic Tree below. True False