Part 1 of 2 - 50.0/ 50.0 Points Question 1 of 40 2.5/ 2.5 Points Which one of the following statements is true? A. Natural selection works on variation already present in a population. B. Natural selection works on non-heritable traits. C. Individuals evolve through natural selection. D. Organisms evolve structures that they need. Question 2 of 40 2.5/ 2.5 Points The human genome contains approximately __________ genes. A. 1,000-2,000
B. 50,000-60,000 C. 21,000 D. 2,000-3,000 Question 3 of 40 2.5/ 2.5 Points While on the Beagle , Darwin was influenced by a book by Charles Lyell that suggested that Earth was __________ and sculpted by geologic processes that __________ today. A. old; continue B. old; no longer occur C. young; continue
D. young; no longer occur Question 4 of 40 2.5/ 2.5 Points What technique is most commonly used to sequence entire genomes? A. The whole-genome shotgun method B. The nucleic acid probe method C. The plasmid method D. The genetic marker method Question 5 of 40 2.5/ 2.5 Points Which of the following is an example of disruptive selection?
A. The birth weight at which newborn humans are most likely to survive and the average weight of newborn humans are about the same. B. There is an increase in antibiotic-resistant strains of bacteria. C. There is an increase in the number of different breeds of dog. D. Garter snakes with different coloration patterns behave differently when threatened. Question 6 of 40 2.5/ 2.5 Points Your family is taking a long driving vacation across the midwestern and western United States. As you travel, you notice that the flowers, birds, and trees of the Midwest and the Rocky Mountains are very different. As you ponder why, you remember that such differences in the distribution of species are part of the field of: A. paleontology.
B. geology. C. biogeography. D. morphology. Question 7 of 40 2.5/ 2.5 Points Gene flow is accomplished by: A. migration. B. sexual recombination. C. mutation. D. natural selection.
Question 8 of 40 2.5/ 2.5 Points The total collection of alleles in a population at any one time make up that population's: A. gene pool. B. genotype. C. heterozygosity.
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