Biology 2e
2nd Edition
ISBN: 9781947172517
Author: Matthew Douglas, Jung Choi, Mary Ann Clark
Publisher: OpenStax
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Textbook Question
Chapter 18, Problem 16RQ
Which components of
- a division of populations
- a change in environmental conditions
- ongoing gene flow among all individuals
- a large number of mutations taking place at once
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What is adaptive radiation?
Large-scale evolutionary patterns and trends in speciation
The event when a species no longer has living members
A lineage undergoes a burst of genetic divergences that gives rise to many species
Changes in allele frequency that are always occurring in natural populations
Speciation events can occur on a variety of timescales. Which factor is NOT likely to influence the
rate of speciation?
Selection pressures
Color of the organism
Generation time
Mutation rate
How is sympatric speciation different from allopatric speciation?
Group of answer choices
Allopatric speciation requires a geographic barrier, while sympatric speciation occurs in one place
Allopatric speciation results in hybrids, while sympatric speciation does not
Allopatric speciation is a result of behavioral isolation, while sympatric speciation is a result of habitat isolation
Allopatric speciation occurs in one place, while sympatric speciation requires a geographic barrier
Chapter 18 Solutions
Biology 2e
Ch. 18 - Figure 18.14 Which is most likely to survive,...Ch. 18 - Figure 18.22 If two species eat a different diet...Ch. 18 - Figure 18.23 Which of the following statements is...Ch. 18 - Which scientific concept did Charles Darwin and...Ch. 18 - Which of the following situations will lead to...Ch. 18 - Which description is an example of a phenotype? A...Ch. 18 - Which situation is most likely an example of...Ch. 18 - Which situation would most likely lead to...Ch. 18 - What is the main difference between dispersal and...Ch. 18 - Which variable increases the likelihood of...
Ch. 18 - What is the main difference between autopolyploid...Ch. 18 - Which reproductive combination produces hybrids?...Ch. 18 - Which condition is the basis for a species to be...Ch. 18 - Which situation is not an example of a prezygotic...Ch. 18 - Which term is used to describe the continued...Ch. 18 - Which components of speciation would be least...Ch. 18 - If a person scatters a handful of garden pea plant...Ch. 18 - Why do scientists consider vestigial structures...Ch. 18 - How does the scientific meaning of “theory” differ...Ch. 18 - Explain why the statement that a monkey is more...Ch. 18 - Why do island chains provide ideal conditions for...Ch. 18 - Two species of fish had recently undergone...Ch. 18 - Why can polyploidy individuals lead to speciation...Ch. 18 - What do both rate of speciation models have in...Ch. 18 - Describe a situation where hybrid reproduction...
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, biology and related others by exploring similar questions and additional content below.Similar questions
- Figure 18.23 Which of the following statements is false? Punctuated equilibrium is most likely to occur in a small population that experiences a rapid change in its environment. Punctuated equilibrium is most likely to occur in a large population that lives in a stable climate. Gradual speciation is most likely to occur in species that live in a stable climate. Gradual speciation and punctuated equilibrium both result in the evolution of new species.arrow_forwardIn birds, where the female typically handpicks the male to reproduce with, there are clear differences in appearance between the genders. That difference in appearance is called Gender Binarism Runaway Selection Sexual Dimorphism Divergent Evolutionarrow_forwardAssume you are studying a population of ocean shrimp that reproduce asexually. You sequence the ocean shrimp and the species that is their closest living relative that reproduces sexually. You find that the asexually reproducing species has a higher number of mutations in the genome. This finding would provide support for which of the following ideas? Linkage disequilibrium Stabilizing selection Disruptive selection Muller's ratchetarrow_forward
- 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 abovearrow_forwardA factor that is always necessary for the formation of a new spieces is reproduction at different times geographic barriers different mating behaviors reproductive isolation Genetic differences between population tend to be reduced by mutation the bottleneck effect gene flow the founder effect Which of the following factor would not contribute to allopatric speciation a population is geographically separated, leaving one small population in which genetic drift occurs different mutations begin to distinguish the gene pools of the separated populations a population becomes geographically isolated from the original population gene flow between the two separated populations continues to occur an isolated population is exposed to different selective pressures than the original population Male lion having a mane while female lion is an example of intrasexual selection hybridization intersexual selection sexual dimorphismarrow_forwardWhich of the following would NOT be a reason for a speciation event? Group of answer choices comfortable environmental conditions plentiful food supplies very few natural disasters and/or catastrophic events increased amounts of predators lack of predatorsarrow_forward
- Speciation Match each situation to the type of speciation that is likely to occur. NOTE: If you want to change your selection, you'll need to delete the one you already chose. After you delete it, the list of choices will pop back up and you can make a different choice. A behavioral change prevents interaction between individuals from two groups sympatric Small groups become spread out over many different islands with different habitats adaptive radiation a valley becomes divided by a river, separating two groups allopatricarrow_forwardThe 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…arrow_forwardHybridization was not originally recognized as a mechanism of speciation by either Darwin or the researchers of the "new synthesis". However, today there are many examples of species that have originated through hybridization. What is the best explanation for why we have so many examples of species originating through hybridization? Hybridization is more likely to occur in regions where scientists have put in more effort studying speciation Hybridization has been carried out frequently by farmers attempting to produce new, better species to grow Hybridization occurs fairly regularly, and when it leads to new species only takes a few generations, which is fast enough for researchers to see fairly easily Hybridization is fairly easy to study in captivityarrow_forward
- Helparrow_forwardWhich of the following will prevent speciation from happening? * Geographic Isoloation Mutations Interbreeding Behavioral Isolationarrow_forwardWhich of the following is NOT a component of the Theory of Evolution by Natural Selection? Group of answer choices inheritance of acquired characteristics competition for food and space variation among species survival and reproductionarrow_forward
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