When species are kept separate by preventing the formation of hybrid zygotes, the mechanism that keeps the species separate is known as a _____________ isolating mechanism.
A. hybridization
B. postzygotic
C. prezygotic
D. adaptive
E. differential
C. prezygotic
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Which statement best describes the correlation between beak depths of Geospiza fortis on the Galápagos island Daphne major and the dryness of the environment?
A. Birds with large beaks are favored during wet years. B. Birds with small beaks are favored in dry years. C. Birds with large beaks are favored during dry years. D. Birds with either size beak (large or small) are favored equally. Clarify Question What is the key concept addressed by the question? What type of thinking is required? Gather Content What do you already know about natural selection? What other information is related to the question? Choose Answer Given what you now know, what information is most likely to produce the correct answer? Reflect on Process Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
Microsatellites and minisatellites are distinguished from each other by the length of each repeating unit
Indicate whether the statement is true or false
An animal that kills for food is a
A. predator. B. parasite. C. scavenger. D. All of these answers are true.
During a stay in the hospital, an accident victim develops symptoms of bacteremia. A blood sample shows the presence of Gram-positive cocci in pairs. Lab tests determine that the bacteria are nonhemolytic and bile salt tolerant. The bacteremia is likely due to
A) Enterococcus. B) Mycoplasma. C) Staphylococcus. D) Streptococcus. E) Listeria.