Respuesta :
Natural selection enhanced the prevalence of the drug-resistant bacteria that were already present at the beginning of the treatment.
What is natural selection?
Natural selection is the variation in individual phenotypic traits-based survival and reproduction. The evolution of the heritable features that define a population through generations is a fundamental mechanism of evolution. The term "natural selection" gained popularity thanks to Charles Darwin, who distinguished it from artificial selection by saying that the latter is deliberate while the former is not.
Every population of organisms contains variation. This happens in part because an organism's genome might experience random mutations, which its descendants may inherit. Individuals' genetics and environments interact throughout their lifetimes to produce different phenotypes. A genome's environment comprises the abiotic environment as well as the molecular biology of the cell, other cells, individuals, populations, and species. The population changes as a result of individuals with specific variants of the trait having a higher chance of surviving and procreating than those with other, less successful versions. Fecundity selection and sexual selection, which are now frequently included in natural selection, are other factors that affect reproductive success.
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Within six months of effectively using methicillin to treat S. Aureus infections in a community, all new infections were caused by MRSA. How can this result best be explained?
