Several organisms have a homologous protein (inherited from a common ancestor) that is highly similar at the amino acid level. You are comparing the genes that code for these proteins in the different organisms when you note that one of the codon nucleotide positions shows more nucleotide variation than the other nucleotide positions. In which codon nucleotide position do you expect to see the most variability among species?
A. first nucleotide position
B. second nucleotide position
C. fourth nucleotide position
D. third nucleotide position
Ans: D. third nucleotide position
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Consider the cladogram shown. Based on this cladogram, which species has the greatest number of ancestral character states?
A. 1
B. 2
C. 3
D. 4
E. 5
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?
While going for an autumn hike in the forest, you see some trees with green leaves and others with red, yellow, and orange colored leaves. What explains the difference in the leaf color in autumn?
What will be an ideal response?
Crossing over is one of the most important
events in meiosis because
a. it produces new combinations of alleles on chromosomes. b. separation of homologous chromosomes occurs. c. separation of sister chromatids occurs. d. it results in the production of haploid gametes. e. it aligns homologous chromosomes at the center of the cell so that they can be separated in anaphase II
Comparing the evolution of domesticated dogs to the evolution of wolves over the same time period illustrates what relationship between artificial and natural selection?
A. Artificial selection is more likely to produce maladaptive structures than natural selection. B. Artificial selection cannot produce changes as large as changes produced by natural selection. C. Artificial selection is reversible; natural selection is not. D. In artificial selection, the magnitude of the selection pressure can be varied; in natural selection, it cannot. E. Artificial selection is slower than natural selection.