Answered

Unit 9: Evolution
Name:
me: Anny mojaro
Period: 8°
NOTES 9.9: Antibiotic Resistance
SFLT: Explain how a population of bacteria becomes resistant to antibiotics and how we can prevent it by
analyzing what it means to be "resistant".
DO NOW: Based your answers to questions 1-4 on the information below and on your knowledge of Biology.
Carlos has a real problem on his hands. He sprayed insecticide on the cockroaches outside his
door and some survived! One week later Carlos noticed that the surviving
cockroaches made
dozens of baby roaches! Kadian explained to Carlos that the surviving cockroaches were likely
resistant to the insecticide he sprayed.
1. Based upon this scenario and what we learned yesterday, define resistance in your own words.
2. Explain why the resistant cockroaches will likely outnumber the nonresistant cockroaches over time.
B. Identify the variation that exists within the cockroach population.
6 the
non in the cockroach population



Answer :

GinnyAnswer

Final answer:

Antibiotic resistance in bacteria is driven by genetic variation, natural selection, and the evolution of populations to contain predominantly resistant individuals.


Explanation:

Resistance in bacteria occurs when some individuals possess traits that allow them to tolerate antibiotics due to genetic variation. When antibiotics are applied, they kill most bacteria, but those resistant survive and pass down their resistance traits.

Natural selection leads to the survival and reproduction of antibiotic-resistant bacteria, resulting in the population evolving to predominantly contain resistant individuals. This demonstrates how environmental pressures can drive evolutionary change.

Genetic variation within populations plays a crucial role in the development of antibiotic resistance, as existing resistance genes are selected for under antibiotic use, leading to the rise of superbugs.


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