If 25 individuals of a total population of 50 have the AA genotype and 10 have the Aa genotype, what is the frequency of the "a" allele?
A. 0.5
B. 0.3
C. 0.4
D. 0.6
Ans: C. 0.4
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The peripheral nervous system is composed of:
A. sensory neurons. B. cranial nerves. C. spinal nerves. D. All of the answer options are correct.
Following treatment with restriction enzymes, what procedure would be used to isolate DNA fragments of different lengths?
A. transformation B. transfection C. gel electrophoresis D. colony hybridization E. Western blotting
Which type of chromosomal change occurs when a part of a sequence becomes oriented in the reverse direction?
a. Translocation b. Duplication c. Inversion d. Deletion e. None of these choices.
Which of the following is not a regulatory mechanism used to control the lactose operon in Escherichia coli?
A. Induction B. Attenuation C. Catabolite repression D. All of the choices are correct.