In general, what two methods are used to grow bacteria in the laboratory?
What will be an ideal response?
liquid and semisolid (agar) media
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The figure below shows results of bristle number in Drosophila flies after 35 generations of artificial selection. This figure suggests that
A. bristle number has evolved beyond the original range of phenotypic variation for this trait.
B. after 35 generations of selection, populations no longer exhibit variation in bristle number.
C. natural selection cannot lead to large phenotypic changes.
D. at the end of the experiment, "high population" flies were unable to interbreed with "low population" flies.
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 artificial 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?
Trichoplax adhaerens is considered the closest
animal relative of the choanoflagellates due to a. similar structures to amoeboids. b. sticky base plate. c. microscopic observation. d. fossil evidence. e. genetic evidence.
The first portion of the seedling to emerge from the
seed coat is indicated by a. A. b. B. c. C. d. one of these, but it is impossible to predict which one. e. none of these.
Vascular plants and air-breathing animals first appeared during the:a
Silurian period. b. Ordovician period. c. Cambrian period. d. Permian period. e. Cretaceous period.