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 10RQ
Which variable increases the likelihood of allopatric
- lower rate of mutation
- longer distance between divided groups
- increased instances of hybrid formation
- equivalent numbers of individuals in each population
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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
The 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 sympatrially
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
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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- Speciation Producing offspring that is infertile is a barrier to reproduction. O postzygotic O prezygoticarrow_forwardWhich of these outcomes are examples of reproductive isolation? Select all that apply. Individuals of different species are physically compatible and can engage in sex Hybrid individuals cannot produce offspring Hybrid individuals or their offspring have similar fitness to the original species Reproduction occurs at different times Mating occurs but fertilization does not occurarrow_forwardIn order for speciation to occur, there has to be a reduction in Gene Flow Genetic Drift Mutation Selectionarrow_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_forwardSpeciation Mating at different times of the year is a barrier to reproduction. postzygotic O prezygoticarrow_forwardChoose which evolutionary mechanism is most likely to cause speciation events. founder effect gene flow mutation natural selection non-random matingarrow_forward
- Which of the following forms of reproductive isolation illustrates a prezygotic barrier to gene flow? O Species A forms hybrids with species B and the hybrids are able to breed back with either of the two parent species to produce healthy fertile offspring. O Two closely related birds, the lazuli bunting and indigo bunting, sing similar songs to attract mates and even though human ears can not distinguish them the females never make wrong choices in choosing who to mate with. O Two species of turtles living in a large lake have different ecological requirements and never interact. O Several species of corrals in a Honduras corral reef release gametes about the same time but inter- specific attraction of gametes does not occur. O All but one of these illustrates a type of prezygotic barrier to gene flow.arrow_forwardThe Bateson-Dobzhansky-Muller model: Shows how chromosomal changes can lead to sympatric speciation Shows how epistasis can lead to sympatric speciation Shows how drift, with no selection, can lead to allopatric speciation Shows how selection, with no drift, can lead to allopatric speciation Predicts that reproductive isolation will build up quickly in sympatryarrow_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_forward
- Gene flow is necessary for speciation to take place. Group of answer choices True Falsearrow_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_forwardHow 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 barrierarrow_forward
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