Which of the following situations describes a scenario in which allopatric speciation might occur?
A) A mutation changes the pollinator a plant can utilize.
B) An earthquake separates a lizard population into two groups.
C) A mutation makes certain frogs mate two days earlier in the season.
D) A pair of birds colonizes an island with numerous empty niches.
Refer to the scenario below, and then answer the following question(s).
Species of fruit fly larvae in the genus Rhagoletis each feed on a particular kind of fruit. Rhagoletis pomonella feeds on the small red fruit of the hawthorn tree. In 1865, farmers in the Hudson River valley found that R. pomonella flies had begun attacking their apples and then spread to apple orchards in adjacent areas of Massachusetts and Connecticut. These now separate varieties of flies, the apple and haw flies, usually don't interbreed with each other because their periods of mating coincide with the different ripening times of apples and hawthorn fruit. Each variety is becoming specialized to feed and reproduce in its own particular microhabitat and may be transitioning to separate species.
Answer: B
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Which of the following is a land plant that has flagellated sperm and a sporophyte-dominated life cycle?
A) fern B) moss C) liverwort D) charophyte (stoneworts) E) hornwort
Of the following plastids, which is not paired with its proper function?
A) amyloplasts; sugar synthesis B) chromoplasts; contain non-chlorophyll pigment that give flowers distinctive colors C) chloroplasts; photosynthesis D) proteinoplasts; protein storage E) elaioplasts; lipid storage
In fruit flies the gene for vestigial wings will produce tiny underdeveloped wings at room temperature but will produce normal wings at higher temperatures. The vestigial condition in fruit flies is determined by
A. heredity and environment. B. pleiotropy. C. linkage. D. gene imprinting.
"P" is the chemical symbol for
A. nickel. B. potassium. C. plutonium. D. phosphorus. E. copper.