Scenario 2. Now pretend the predatory fish was not introduced. The population is 20,000 and freq(B) = 0.5. There are not observable differences in the survival or reproductive success of individuals that is related to their spots. A drought drastically reduces the size of the pond, and the population drops to 100 individuals. Twenty years after the drought, the frequency of B is 1.0. A. After the drought, the R allele was ( fixed / lost ). B. Which evolutionary force best explains the change in the frequency of R in Scenario 2? Explain your choice. a. Natural selection b. Genetic drift c. Gene Flow d. Mutation e. Non-random Mating C. What are two (2) different ways that the population could re-gain variation for this gene?

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Answer part C using scenario 2

**Scenario 2:**

Imagine the predatory fish was not introduced. The initial population consists of 20,000 individuals, with the frequency of allele B being 0.5. There are no observable differences in survival or reproductive success linked to individuals' spots. Following a drought, the pond size significantly decreases, leaving a population of only 100 individuals. Twenty years post-drought, the frequency of allele B becomes 1.0.

A. After the drought, the R allele was ( **fixed** / lost ).

B. Which evolutionary force best explains the change in the frequency of R in Scenario 2? **Explain your choice.**

   a. Natural selection  
   b. Genetic drift  
   c. Gene flow  
   d. Mutation  
   e. Non-random mating  

C. What are two (2) different ways that the population could regain variation for this gene?
Transcribed Image Text:**Scenario 2:** Imagine the predatory fish was not introduced. The initial population consists of 20,000 individuals, with the frequency of allele B being 0.5. There are no observable differences in survival or reproductive success linked to individuals' spots. Following a drought, the pond size significantly decreases, leaving a population of only 100 individuals. Twenty years post-drought, the frequency of allele B becomes 1.0. A. After the drought, the R allele was ( **fixed** / lost ). B. Which evolutionary force best explains the change in the frequency of R in Scenario 2? **Explain your choice.** a. Natural selection b. Genetic drift c. Gene flow d. Mutation e. Non-random mating C. What are two (2) different ways that the population could regain variation for this gene?
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