To help your investigation, here is some more data about the farm. The chicken population was started with chicks from a different farm. Chickens are raised in barns where bacteria can spread easily between chickens. CJ, E. Coli, and Salmonella bacteria are all present in the barns. Some of the E. Coli and Salmonella bacteria have alleles that make them resistant to the FQ antibiotic. To stop disease from growing in the barn, the FQ antibiotic is fed to the chickens a lot. Choose which way of evolution caused the FQ antibiotic resistance.Gene Flow Genetic Drift Natural Selection What is the best fit option here? Form a hyptothesis This is my hypothesis, is it right ? If the chicken population is consistently given the FQ antibiotic, then natural selection leads to antibiotic resistance, because some chickens could have some of the bacterias that develop mutations allele and they can resist against FQ antibiotics. Bacteria which are resistant will continue to increases and grows in number over time. In the end, the chicken population are mainly resistant bacterial, thus making this the likely mechanism of evolution. Then Pl explain how the new data supports the hypothesis
The Correct Answer and Explanation is :
Your hypothesis is correct: the development of FQ antibiotic resistance in the chicken farm is primarily driven by natural selection. Here’s an explanation:
Natural Selection and Antibiotic Resistance
In the chicken barns, bacteria such as E. coli and Salmonella are present, some of which have alleles conferring resistance to the FQ antibiotic. When the FQ antibiotic is administered consistently, it creates a selective pressure favoring bacteria that can survive its effects. Bacteria without resistance alleles are killed or inhibited, while those with resistance alleles survive and reproduce. Over time, this process leads to an increase in the proportion of resistant bacteria within the population. This is a classic example of natural selection, where environmental pressures result in the survival and reproduction of individuals with advantageous traits.
Supporting Data
The data provided supports this hypothesis:
- Consistent Use of FQ Antibiotics: The regular administration of FQ antibiotics to the chickens ensures that only bacteria capable of surviving the antibiotic can thrive.
- Presence of Resistant Bacteria: The barns contain bacteria with alleles that make them resistant to FQ antibiotics, indicating that such mutations exist within the bacterial population.
- High Density of Chickens: Raising chickens in barns where bacteria can spread easily increases the likelihood of resistant bacteria transmitting their resistance genes to other bacteria, further promoting the spread of resistance.
These factors collectively create an environment where natural selection favors the survival and proliferation of FQ-resistant bacteria.
Conclusion
In summary, the consistent use of FQ antibiotics in the chicken barns applies selective pressure that favors the survival and reproduction of bacteria with resistance alleles. This process, known as natural selection, leads to an increase in the population of antibiotic-resistant bacteria over time. Therefore, natural selection is the primary mechanism of evolution responsible for the observed FQ antibiotic resistance in the chicken farm.