Certain strains of bacteria that were killed by the antibiotic penicillin in the past are now resistant. The probable explanation for this is that the reproductive rate must have increased naturally. a mutation for resistance occurred that was passed on to succeeding generations because it had high survival value. the strains have become resistant because they needed to do so for survival. individual bacteria gradually became tolerant to increasing levels of penicillin over some time.

Answer - Option D - Individual bacteria gradually became tolerant to increasing levels of…

Answered: Certain strains of bacteria that were…

Certain strains of bacteria that were killed by the antibiotic penicillin in the past are now resistant. The probable explanation for this

Human Heredity: Principles and Issues (MindTap Course List)

11th Edition

ISBN:9781305251052

Author:Michael Cummings

Publisher:Michael Cummings

Chapter19: Population Genetics And Human Evolution

Section: Chapter Questions

Problem 1CS: If you suspected that heterozygous carriers of a particular disease gene had a selective advantage...

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		the reproductive rate must have increased naturally.
		a mutation for resistance occurred that was passed on to succeeding generations because it had high survival value.
		the strains have become resistant because they needed to do so for survival.
		individual bacteria gradually became tolerant to increasing levels of penicillin over some time.