Which type of crossover event produces no recombinant chromosomes?
A) single-strand crossover
B) two-strand double crossover
C) three-strand double crossover
D) four-strand double crossover
E) None of the above; all crossover events produce recombinant chromosomes.
B
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Consider the cladogram shown. Which pair of species shares the greatest number of derived characters (synapomorphies)?
A. 1 and 3
B. 6 and 4
C. 6 and 5
D. 2 and 3
E. 6 and 3
Clarify Question
· What is the key concept addressed by the question?
· What type of thinking is required?
· What key words does the question contain and what do they mean?
Gather Content
· What do you already know about cladistics?
Consider Possibilities
· What other information is related to the question? Which information is most useful?
Choose Answer
· Given what you now know, what information and/or problem solving approach 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?
Disagreements between conclusions obtained from rDNA data and other techniques may be explained by
A. horizontal DNA transfer. B. vertical DNA transfer. C. the difference in translation machinery. D. vertical RNA transfer.
The letter "A" from the above figure represents
a. ectoderm. b. endoderm. c. mesoderm. d. neural plate. e. yolk
Which of the following is the major reason why it has been difficult to treat viral infections with chemotherapeutic agents?
A. Viruses have no metabolism and therefore offer no selective point of attack. B. Actually, viruses are not difficult to treat with chemotherapeutic agents. C. Viruses use the metabolic machinery of their hosts, which limits many of the potential points of attack. D. Viral metabolism resembles that of their hosts so there is no selective point of attack.