In 1943, drug companies began mass-producing penicillin. at that time, it was a medical miracle and was used as a remedy for infected wounds, pneumonia, and other bacterial diseases. just four years later, however, it was no longer effective on the same diseases that it had previously been able to cure. what happened?

Gene flow and genetic drift both affect allele frequencies in a population. a high level of gene flow into a population genetic diversity in a population. a high level of gene flow out of a population genetic diversity in a population. genetic drift is the change in allele frequencies due to factors. typically, genetic drift has the biggest impact on populations.