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| Plant species A has a diploid chromosome number of 18. Plant species B has a diploid chromosome number of 10. A new species C arises as an allopolyploid of species A and B. What is the most likely diploid chromosome number of species C? |
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| Which of the following groups would be placed nearest the fungi in a phylogenetic tree based on DNA sequences? |
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| Populations of Larus gulls around the North Pole show an unusual pattern of reproductive isolation. Each population is able to interbreed with its neighboring populations, but populations separated by larger geographic distances are not able to interbreed. This type of species complex is known as a: |
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| Horses and donkeys can breed and produce sterile offspring known as mules. Horses and donkeys remain separate species because of this hybrid sterility, which is: |
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| a postzygotic barrier to reproduction. |
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| If formerly interbreeding organisms are prevented from the production of fertile offspring, ____________ has occurred. |
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| Which of the following is NOT a prezygotic barrier to interbreeding between different species? |
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| Hybrids between the two species are infertile. |
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| The morphological species concept: |
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| groups species based on similar phenotype. |
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| All mammals have hair because they inherited that trait from a common ancestor. Features that are inherited from a common ancestor are called: |
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| To which one of the following is the bat's wing NOT homologous? |
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| The biological species concept is primarily based on: |
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| The taxonomic rank that includes species but not families is: |
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| According to the biological species concept, species are natural populations of organisms that have the potential to interbreed and that are ____________ isolated from other such populations. |
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| All living organisms have evolved from a single common ancestor. The existence of which molecule lends the greatest support to this statement? |
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| The oldest prokaryotic fossils have been dated: |
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| The current mass extinction is believed to be primarily caused by: |
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| At the time life first evolved on earth: |
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| there was less oxygen and more methane in the atmosphere than there is today. |
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| The __________________________ propelled the flowering plants to an explosive adaptive radiation. |
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| evolutionary innovation of the flower |
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| “Establishing a phylogeny for bacteria is more difficult than establishing a phylogeny for plants or animals.” This statement is: |
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| correct because bacteria can engage in lateral gene transfer. |
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| The taxonomic rank that includes genera but not orders is: |
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| Researchers have found that mixtures of phospholipids placed in water or salt solutions tend to spontaneously form: |
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| small spherical units that resemble living cells. |
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