49. Which of the following statements regarding balancing selection is FALSE?
(A) The balancing selection maintains genetic diversity in a population.
(B) The balancing selection can create a balanced polymorphism.
(C) Homozygote advantage is usually favored by the balancing selection.
(D) The balancing selection is a type of natural selection which does not always cause the elimination of weaker alleles.
(E) The balancing selection can occur through negative frequency-dependent selection.

45. The emergence of 14 species of Galápagos finches from a common ancestor that finds itself in a new environment is called (A) adaptive radiation. (B) jumping selection. (C) disruptive selection. (D) sympatric speciation. (E) hybridization.

46. The life history strategy of an k-selected species is to (A) take advantage of human activity, such as clearing woodlots. (B) allocate energy to their own survival and to the survival of their descendants. (C) produce thousands of eggs. (D) become prey. (E) reproduce at early age.

47. Which of the following mechanisms is essential for animal navigation? (A) a time keeping mechanism (B) a color recognition mechanism (C) a scent recognition mechanism (D) a sound discrimination mechanism (E) a touch discrimination mechanism

48. The sexually mature organism retains traits of the juvenile stage of the organism’s ancestor. This is called_____. (A) metamorphosis (B) pesudomorphosis (C) paedomorphosis (D) premorphosis (E) adultery

50. Isolated populations will lose a percentage of their original diversity over time, approximately at the rate of 1/(2N) per generation, where N= population size. After 20 generations, the original population of 500 will lose ___ of its original genetic variation. (A) 20% (B) 2% (C) 4% (D) 8% (E) 16%.

 51. Which of the following statements about umbrella species is correct? (A) Umbrella species are species whose habitat requirements are critical to a certain small area. (B) The Northern spotted owl (Strix occidentialis) is considered to be an important umbrella species. (C) The gopher tortoises (Gopherus polyphemus) is considered to be an important umbrella species. (D) Umbrella species must be attractive and more readily engendered support from the public for their conservation. (E) Formosan macaques are considered to be an important umbrella species in Taiwan.

52. In present populations of Taiwan Hwa-Mei (Leucodioptron taewanum) in Taiwan, genetic diversity has been (A) lost through mutation and restored by natural selection. (B) lost through stabilizing selection and restored by balancing selection. (C) lost through directional selection and restored by balancing selection. (D) lost through hybridization and restored by natural selection. (E) lost through artificial selection and restored by natural selection.

53. The Morakot typhoon inflicted catastrophic damages on rivers and wiped out entire population of fishes in the river. This is an example of (A) a density-dependent effect. (B) the effects of abiotic factors. (C) the interaction between density-dependent and abiotic factors. (D) founder effect. (E) dispersal effect.

54. Which of the following mating systems does the Pheasant-tailed Jacana (Hydrophasianus chirurgus) exhibit in paddy fields in Tainan? (A) monogamy (B) polyandry (C) polygyny (D) promiscuity (E) none of the above

55. When Thomas Hunt Morgan crossed his red-eyed F1 generation flies to each other, the F2 generation included both redand white-eyed flies. Remarkably, all the white-eyed flies were male. What was the explanation for this result? (A) The gene involved is on the X chromosome. (B) The gene involved is on the Y chromosome. (C) The gene involved is on an autosome. (D) Other male-specific factors influence eye color in flies. (E) Other female-specific factors influence eye color in flies.