Welcome to My AP Biology Thoughts podcast, I am Emily Greenberg and I am Angelina Graf and we will be your hosts for “Unit 7 Heredity: Examples of Evolution-antibiotic resistance”. In episode 113, we will be discussing antibiotic resistance and how it relates to the AP Biology Curriculum.
Segment 1: Overview of antibiotic resistance
Antibiotics are drugs that fight infections that are caused by bacteria
Antibiotic resistance is when bacteria and germs build up resistance to the medications that are meant to kill them
Antibiotic resistant germs are often very difficult to treat and dangerous infections can emerge
A common misconception is that antibiotic resistance means that the body is resisting antibiotics, however it is actually the bacteria that is becoming resistant to antibiotics
Overuse of antibiotics is one of the main causes of antibiotic resistance
Segment 2: Evidence that supports antibiotic resistance
Antibiotics also kill good bacteria that help to protect the body from infection
Antibiotic resistant germs can spread throughout healthcare facilities, the environment, and other communities.
The action of an antibiotic is an environmental pressure
Species have to adapt and evolve in order to survive these pressures
We know that evolution is happening because bacterial infections can continue to spread even with the presence of antibiotics
In WWI, penicillin treatment was used to treat the wounded and by some smaller civilian populations
Biochemists began reporting resistance to it before the war was over and found a penicillin-inactivating enzyme secreted from a particular bacteria.
Over the next few decades, overuse and repeated exposure to antibiotics helped the selection and replication of antibiotic resistant strains of bacteria
Segment 3: Connection to the Course
Antibiotic resistance evolves as a result of natural selection and genetic mutation
Bacteria that develop mutations that are resistant to antibiotics are more likely to survive and reproduce; this means that they are more fit
If resistant bacteria reproduce with other resistant bacteria, their offspring will be fully resistant and this trait will become more frequent in the gene pool
Overall, antibiotic resistance is dangerous because bacteria can develop resistance to extremely high amounts of antibiotics in a short amount of time which would leave patients very difficult to treat
It’s crucial to understand Antibiotic resistance to ensure that harmful antibiotic resistant bacteria don’t evolve faster than our ability to treat them
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"Ice Flow" Kevin MacLeod (incompetech.com)
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