BIOLOGY 2E
2nd Edition
ISBN: 9781506699851
Author: OpenStax
Publisher: XANEDU PUBLISHING
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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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Students have asked these similar questions
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
Which of the following has the least tendency to lead to speciation?
disruptive selection
directional selection
genetic drift
gene flow
polyploidy
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_forwardThe phyletic gradualism model of speciation asserts that; Most speciation occurs allopatrically 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 sympatriallyarrow_forwardAlfred Russel Wallace agreed with Charles Darwin about which of the following evolutionary ideas? that the most common force causing evolutionary change is natural selection that the most common branching pattern in speciation is cladogenesis that the most common geographic pattern in speciation is sympatric that the most common branching pattern in speciation is anagenesis that the most common geographic pattern in speciation is allopatricarrow_forward
- Which of the following forces of evolution tends to slow down population divergence and prevent speciation? Group of answer choices Sexual selection Genetic drift Gene flow Mutation Natural selectionarrow_forwardWhich 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 isolationarrow_forwardnew species divergence Which row below identifies the model of evolution shown in this diagram and offers the best explanation of this model? The statement above is best completed by the answers in row: Row Model Explanation evolutionary history consists of long periods of equilibrium where there is little change, interrupted by periods of speciation gradualism punctuated equilibrium gradual change occurs steadily in a linear fashion; big changes (such as the evolution of a new species) occur as a result of many small changes gradual change occurs steadily in a linear fashion; big changes (such as the evolution of a new species) occur as a result of many small changes gradualism punctuated equilibrium evolutionary history consists of long periods of equilibrium where there is little change, interrupted by periods of speciation Timearrow_forward
- Assume 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_forwardWhich 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_forwardIf one were to look at the timeline of speciation, most organisms go through this process fairly slowly, this is with the exception of natural selection polyploidy reinforcement colonizationarrow_forward
- A 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 sets of evidence supports the idea that species share common ancestry? Similar modern species are often found living in the same areas Different species share similarities at the genetic, developmental, and structural level Modern populations can be observed diverging from one another, indicating the start of speciation All of the abovearrow_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
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