Chapter 24- The Origin of Species
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
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| In the case of the Lake Victoria cichlids, sympatric speciation has been shown to be driven by __________. | show 🗑
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| show | postzygotic; reduced hybrid fertility
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| show | hybrid breakdown
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| show | the tempo of evolution consists of abrupt episodes of speciation among long periods of equilibrium
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| show | mechanical isolation
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| Which of the following evolutionary mechanisms does not contribute to the process of allopatric speciation? | show 🗑
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| show | plants
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| What is the first thing that must happen in order for speciation to occur? | show 🗑
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| show | Gene pool changes establish reproductive barriers between two populations.
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| show | Species tend to change rapidly in a short period of time.
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| show | Temporal isolation
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| A new species of plant evolved by allopolyploidy from two species of plant that are 2n=6 and 2n=12. What would the diploid number of chromosomes be in this new species? | show 🗑
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| When gene flow between two populations ceases, the potential for _______ exists. | show 🗑
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| The behavior of a male blue-footed boobie during the courtship ritual elicits no response from the masked boobie. The reproductive barrier between them is an example of _______________. | show 🗑
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| show | speciation
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| show | a geographic barrier splitting a population
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| show | allopatric speciation
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| show | vary widely and depend on generation times, causes of speciation, environmental factors, and chance
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| show | contribute to reproductive isolation after a hybrid zygote has been formed
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| show | 32
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| The morphological species concept distinguishes species by ________________________. | show 🗑
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| Three species of a sea stars all mate near the same reef by secreting their gametes into the water, but none of the gametes from the different species fertilize each other. This is an example of a _____________ barrier called ____________. | show 🗑
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| How many genes must change in order to form a new species? | show 🗑
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| show | a region in which members of different species meet and mate, producing at least some offspring of mixed ancestry
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| show | prevent fertilization of gametes from members of closely related species
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| Which of the following is an example of a postzygotic reproductive barrier? | show 🗑
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| A new species of plant is discovered that closely resembles a known species. Upon further examination, it is discovered that the new species has a tetraploid number of 4n = 12, while the known species has a diploid number of 2n = 6. Which of the followi | show 🗑
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| According to the __________, a species is a group of populations whose members have the potential to interbreed in nature and produce viable, fertile offspring—but do not produce viable, fertile offspring with members of other such groups. | show 🗑
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| Imagine that part of a population of South American finches is blown by a storm onto an island far offshore and manages to survive and reproduce there for a period of 10,000 years. After that period, a climate change results in lower sea levels and the | show 🗑
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| show | not applicable for extinct species
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| morphological | show 🗑
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| show | based on evolutionary history
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| morphological and phylogenetic | show 🗑
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| prezygotic barriers | show 🗑
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| show | reduced hybrid fertility- offspring of two newts are sterile
reduced hybrid viability- lion-tiger hybrid don't reach maturity
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| show | gene flow
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| Two animals are considered members of different species if they _____. | show 🗑
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| What is genetic drift? | show 🗑
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| Why are the large finches now living on the Galápagos Islands different from the original source population from a nearby island? | show 🗑
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| True or false? The last ice age produced many different species mainly because populations dispersed and colonized new habitats. | show 🗑
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| Which of the following statements about reinforcement is true? | show 🗑
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| A subset of a population of birds leaves its habitat on the mainland and colonizes a nearby island. The birds, after a period of time, become reproductively isolated. The island sinks and the population of birds that lived on the island returns to itsorig | show 🗑
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| show | Increased fitness of large-beaked birds, leading to natural selection
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| show | True
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| show | Meiosis cannot occur.
The cells do not contain homologous chromosomes.
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| The sequence of events illustrated in this figure results in a fertile hybrid plant called an allopolyploid. Which of the following statements is the most complete description of an allopolyploid? | show 🗑
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| Plant species F has a diploid number of 8. Plant species G has a diploid number of 10. What would be the diploid number of an allopolyploid hybrid of species F and species G? | show 🗑
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| What role does nondisjunction play in the formation of a fertile allopolyploid hybrid? | show 🗑
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| show | the evolution of reproductive isolation
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| A certain species of salamander was split into two populations by a wide, dry valley, and the populations began to diverge from each other. After a period of time, some members of the two populations began to interbreed in a hybrid zone at the southern en | show 🗑
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| Feathers either play a role, or may have played a role, in _____. | show 🗑
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| show | adaptive radiaton
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| show | adaptive radiation
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| show | adaptive radiation
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| The different finch species found on the Galápagos Islands probably arose as a result of _____. | show 🗑
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