BIOLOGY VOL. II
16th Edition
ISBN: 9781308795317
Author: Raven
Publisher: Mcgraw-Hill/Create
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Textbook Question
Chapter 22, Problem 3A
Hybridization between incompletely isolated populations
a. always leads to reinforcement due to the inferiority of hybrids.
b. can serve as a mechanism for preserving gene flow between populations, thus preventing
c. only occurs in plants.
d. never affects rates of speciation.
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Students have asked these similar questions
If reinforcement is weak and hybrids are not completely infertile,
a. genetic divergence between populations may be overcome by gene flow.
b. speciation will occur 100% of the time.
c. gene flow between populations will be impossible.
d. the speciation will be more likely than if hybrids were completely infertile.
1) In allopatric speciation, geographic separation of two populations
a.reduces the relative fitness of hybrid offspring.
b.is sufficient for speciation to occur.
c.allows gene flow between them.
d.inhibits gene flow between them.
Problems with the biological species concept include the fact that
a. many species reproduce asexually.
b. postzygotic isolating mechanisms decrease hybrid viability.
c. prezygotic isolating mechanisms are extremely rare.
d. All of the choices are correct.
Chapter 22 Solutions
BIOLOGY VOL. II
Ch. 22 - Prezygotic isolating mechanisms include all of the...Ch. 22 - Reproductive isolation is a. a result of...Ch. 22 - Problems with the biological species concept...Ch. 22 - Prob. 4UCh. 22 - Prob. 5UCh. 22 - Prezygotic isolation a. always involves mechanisms...Ch. 22 - Speciation by allopolyploidy a. takes a long time....Ch. 22 - Adaptive radiation a. is the result of enriched...Ch. 22 - Prob. 9UCh. 22 - Character displacement a. arises through...
Ch. 22 - Prob. 11UCh. 22 - If reinforcement is weak and hybrids are not...Ch. 22 - Natural selection can a. enhance the probability...Ch. 22 - Hybridization between incompletely isolated...Ch. 22 - Natural selection can lead to speciation a. by...Ch. 22 - Natural selection can lead to the evolution of...Ch. 22 - If there is no universally accepted definition of...Ch. 22 - Refer to figure 22 6 In Texas. Drummond s phlox is...Ch. 22 - Refer to figure 22.16. Geospiza fuliginosa and...
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- Which of the following is an example of postzygotic reproductive isolation?a. Sperm of species A dies in the oviduct of species B before fertilization can take place.b. Hybrid zygotes between species A and B are spontaneously aborted early indevelopment.c. The mating seasons of species A and B do not overlap.d. Males of species A are not attracted to the pheromones produced by the females ofspecies B.arrow_forwardIf two species of holly (genus Ilex ) flower during different months, their gene pools may be kept separate by: a. mechanical isolation. b. ecological isolation. c. gametic isolation. d. temporal isolation. e. behavioral isolation.arrow_forwardIdentify each of the following reproductive barriers as prezygotic or postzygotic. a. One lilac species lives on acidic soil, another on basic soil. b. Mallard and pintail ducks mate at different times of the year. c. Two species of leopard frogs have different mating calls. d. Hybrid offspring of two species of jimsonweed always die before reproducing. e. Pollen of one kind of pine tree cannot fertilize another kind.arrow_forward
- Allopatric, but not sympatric, speciation requiresa. reproductive isolation.b. geographic isolation.c. spontaneous differences in males and females.d. prior hybridization.e. rapid rate of mutation.arrow_forwardA mountain range divides a freshwater snail species into two large isolated populations. Erosion eventually lowers the range and brings the two populations together again, but when they mate, the resulting hybrids all produce sterile young. This scenario is an example of: O A. allopatric speciation by vicariance. O B. sympatric speciation. C. parapatric speciation. D. allopatric speciation by peripheral isolation. « » A Moving to another question will save this response. 8:02 AM 11/10/20 a 18 hp 近arrow_forward1. Sea urchins are broadcast spawners that release clouds of sperm/eggs into the water column. However, the ability to successfully fertilize the egg by the sperm is restricted to very specific gametic proteins that inhibit cross species fertilization. This is an example of a a. Post zygotic barrier b.Habitat isolation c.Mechanical isolation d.Pre zygotic barrier e.Hybrid breakdownarrow_forward
- Which of the following is not an event that can contribute to allopatric speciation? a. A mountain range forms and splits two populations into populations that begin to turn into new species. b. A subset of individuals disperse to a far away island and begin to turn into a new species. c. Two populations breed in the same location but at different times, and therefore begin to turn into two new species. d. A river splits a population into two populations and the two populations begin to diverge on either side of the river. e. All of these are potential contributors to allopatric speciation.arrow_forwardA sudden increase in gene flow between two somewhat isolated populations would most likely Group of answer choices a. have no effect on the chance of speciation b. decrease the genetic similarity between the two populations c. increase the chance of speciation d. increase the genetic divergence between the two populations e. decrease the chance of speciationarrow_forwardIf gene flow between two populations stops, which of the following could occur given enough time? a. speciation b. the population each gain unique alleles c. the timing of reproduction changes ending their ability to interbreed d. frequencies of alleles shift in different ways e. these are all things that could occur if gene flow between two populations of one species ended, given enough timearrow_forward
- A defining characteristic of sympatric speciation is a.The appearance of new species in the midst of old ones b.Asexually reproducing populations c.Geographic isolation. d.Large populationsarrow_forwardWhich of the following traits is more associated with an Opportunistic (Equilibrial) species? Which of the following traits is more associated with an Opportunistic (Equilibrial) species? A. Short maturation time B. Producing offspring at many different times over the course of life C. Producing a lot of eggs at one time D. High juvenile mortality E. High level of parental carearrow_forwardTwo very similar cricket species in the Amazon basin occur on opposite sides of the Amazon river (crickets can’t swim). What type of speciation process probably caused them to split into two forms? Group of answer choices a. sympatric b. allopatric c. reinforcement d. fusion e. stable hybrid zonearrow_forward
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