Which of the following was darwin unaware of when he

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26. Which of the following was Darwin unaware of when he developed his theory on the Origin of Species via Natural Selection: A. Humans and chimpanzees share a common evolutionary ancestor B. Formation of the earth occurred much more than a billion years ago C. Genetic material passed from parent to offspring via genes encoded within DNA D. B and C E. A, B, and C 27. In many animal species, mature males are much larger than mature females. This size difference can be attributed to: 28. You sample a population of butterflies and find that 42% are heterozygous for a particular gene. What would be the frequency of the recessive allele in this population?
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29. Fossil evidence indicates that horses have gradually increased in size over geologic time. This is likely caused by: 30. Speciation: A. occurs at such a slow pace that no one has ever observed the emergence of new species. B. occurs only by the accumulation of genetic change over vast expanses of time. C. must begin with the geographic isolation of a small, frontier population. D. proceeds at a uniform tempo across all taxa. E. occurs via anagenesis and cladogenesis, but only the latter increases biodiversity. 31. Some species of Anopheles mosquito live in brackish water, some in running fresh water, and others in stagnant water. What type of reproductive barrier is most obviously separating these different species? 32. A rapid method of speciation that has been important in the history of flowering plants is: 33. Which of the following must occur during a period of geographic isolation in order for two sibling species to remain genetically distinct following their geographic reunion in the same home range? 34. In a hypothetical situation, a certain species of flea feeds only on pronghorn antelopes. In rangelands of the western United States, pronghorns and cattle often associate with one another. If it should happen that some of these fleas develop a strong preference, instead, for cattle blood and mate only with fleas that, likewise, prefer cattle blood, it is possible that over time ________ will occur. 1. reproductive isolation 2. sympatric speciation 3. habitat isolation 4. prezygotic barriers 5. cladogenesis A. 1 only B. 2 and 3 C. 1, 2, and 3
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D. 1, 2, 3, and 5 E. 1 through 5
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