Loss of a chromosome segment is called a(n)
a. translocation.
b. inversion.
c. deletion.
d. substitution.
Ans: c. deletion.
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During normal climatic conditions with regular rainfall, the average beak depth for a population of finches was 6.8mm. Researchers found that after a drought, average beak depth increased to 8.8mm. Birds with deep beaks (>9mm) were better able to eat large, hard seeds. Small hard seeds were also available after the drought, but could only be eaten by birds with shallow beaks (<7mm). Choose the graphical representation and term that best represents what would happen in the post-drought finch population if both types of seeds continue to be available.
a. directional selection.
b. disruptive (diversifying) selection.
c. stabilizing selection.
d. balancing selection.
e. negative frequency-dependent selection.
The French taxonomist who, in 1809 was the first scientist to suggest that organisms that use one part of their body repeatedly would increase their abilities was
A. Charles Darwin B. Alfred Russel Wallace C. Jean lamarck D. Georges Buffon. E. Charles Lyell.
Which of the following is NOT involved in the regulation of the lac operon?
A) an inducer B) a repressor protein C) an iRNA D) glucose E) cyclic AMP
Structural genes code for
A. ribosomal RNA molecules. B. transfer RNA molecules. C. gene expression elements. D. cellular proteins. E. All of these choices are correct.