Two species of pine. Pinus radiata and Pinus muricota, live together California
ID: 82170 • Letter: T
Question
Two species of pine. Pinus radiata and Pinus muricota, live together California and ARE capable of forming hybrids under laboratory condition. However, they do NOT interbreed in nature because one releases pollen in February and one in April. What is the genetic isolating mechanism involved? A) ecological isolation B) temporal isolation C) gametic isolation D) hybrid inviability A city was intensively sprayed with DDT to control houseflies. The number of houseflies was immediately greatly reduced. Each year thereafter, the city was sprayed again, but the flies gradually increased in numbers until 10 years later, when they were almost as abundant as the were when the control program began. Which explanation applies to this situation? A) Flies from other areas moved in and replaced the ones killed by DDT. B) The few flies that were affected by DDT but survived developed antibodies to DDT, which they passed on to their descendants. C) The DDT caused new mutations to occur in the surviving flies, resulting in resistance to DDT. D) The DDT killed most flies. The few that were already naturally resistant survived and passed this resistance on to their offspring. Which sequence of events describes natural selection? A) population of a mammal species varies in the length of their legs; water levels rise and the habitat becomes swampy: the individuals with shorter legs are better able to swim food; the population evolves to become shorter-legged. B).A population of a mammal species lives near the water: water levels rise and the habitat becomes swampy; the animals have trouble moving in the water: the population changes to a shorter-legged type so they can move more easily in the water. C) Water levels rise, and a habitat becomes swampy; a population of a mammal species on high ground observes the change; individuals with shorter legs migrate to the area. D) A population of a mammal species lives near the water; water levels rise and the habitat becomes swampy: the act of swimming shortens the legs of the mammals; the offspring of the mammal species have shorter legs. Planting trees can combat global warming, because A) photosynthesis from those trees absorbs CO_2, a greenhouse gas, from the atmosphere. B) photosynthesis from those trees absorbs O_2, a greenhouse gas, from the atmosphere. C) photosynthesis from those trees will produce carbohydrates that can be used as a greenhouse-gas-free fuel. D) in the process of photosynthesis, the leaves of those trees will intercept photons from the sun, thus reducing the amount of heat reaching the earth.Explanation / Answer
16. ANS: B. Temporal Isolation
17. ANS: D. The DDT killed most flies. The few that were already naturally resistant survived and passed this resistance on to their offspring.
18. ANS: A. A population of a mammal species varies in the length of their legs; water levels rise and the habitat become swampy; the individuals with shorter legs are better able to swim to food; the population evolves to become shorter-legged.
19. ANS: A. Photosynthesis from those trees absorbs CO2, a greenhouse gas, from the atmosphere.
Planting trees can combat global warming, because photosynthesis from those trees absorbs CO2, a greenhouse gas, from the atmosphere.
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