Many mutations have no effect on the proteins they encode. These mutations are considered neutral. Occasionally, a mutation may make a protein even better than it was before. Or the protein might help the organism adapt to a new environment. These mutations are considered beneficial. An example is a mutation that helps bacteria resist antibiotics. Bacteria with the mutation increase in numbers, so the mutation becomes more common. Other mutations are harmful. They may even be deadly. Harmful mutations often result in a protein that no longer can do its job. Some harmful mutations cause cancer or other genetic disorders.
Context:
Jenny goes to the doctor today. She has noticed a lump growing and needs to get a mammogram done. She is incredibly worried and not sure what she should do.
Q: Given a bacteria mutates to become resistant to an antibiotic, would this be considered a helpful or harmful mutation?