Which of the following likely reflects the presence of one or more gene mutations?
A. The bacteria that cause gonorrhea, a common sexually transmitted disease, have previously been killed by penicillin; however, after continuous usage of the antibiotic, penicillin-resistant strains are now becoming prevalent.
B. Radiation causes an alteration in a DNA nucleotide sequence, which is discovered when mapped, but which appears to be neither increasing nor decreasing in successive generations.
C. Fruit flies subjected to intense radiation produce a wider array of variable offspring.
D. A chemical leaking from the surface of an old abandoned coal mine alters a regulatory gene so that a cricket nymph develops an extra set of eyes.
E. All of the choices are correct.
Answer: E
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a. true b. false
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