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 Rallele was ( fixed / lost ).
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 Rallele was ( fixed / lost ).
Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
Section: Chapter Questions
Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...
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Answer part A using the given data
Transcribed Image Text:A spotted population of fish in an isolated pond has a gene that controls spot color. The gene has two alleles, black (B) and red (R), and the alleles exhibit co-dominance.
**Scenario 1:**
The frequency of B is initially 0.5, and the population size in the pond is 20,000. A predatory fish is introduced to the pond. Experiments indicate that the predator uses visual cues to find its prey and that it can more easily catch fish with red spots. What will happen to the following frequencies? *(for each row, put an "X" in one of the 4 boxes)*
| | Increase | Decrease | Either Increase or Decrease | Stay the same |
|----------------------|----------|----------|-----------------------------|---------------|
| BB phenotype | | | | |
| BR phenotype | | | | |
| RR phenotype | | | | |
| BB genotype | | | | |
| BR genotype | | | | |
| RR genotype | | | | |
| B allele | | | | |
| R allele | | | | |
**Scenario 2:**
Now pretend the predatory fish was not introduced. The population is 20,000 and freq(B) = 0.5. There are no 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)*.
This educational exercise allows students to explore the impact of environmental changes and selection pressures on allele frequencies in a population. It encourages critical thinking and understanding of concepts such as genetic drift, co-dominance, and natural selection.
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