The A gene has two alleles: \(A_1\) and \(A_2\). The \(A_1\) allele improves fitness in hot weather, but it is deleterious when the weather is cold. The \(A_2\) allele improves fitness in cold weather and decreases fitness in hot weather. Use the fitness of each diploid genotype in the table below to answer the following questions. | | \(A_1A_1\) | \(A_1A_2\) | \(A_2A_2\) | |---------|-----------|-----------|-----------| | **Hot** | 1.0 | 0.8 | 0.5 | | **Cold**| 0.4 | 0.7 | 1.0 | **Explanation of the Table:** The table displays the fitness values of different genotypes (\(A_1A_1\), \(A_1A_2\), \(A_2A_2\)) under hot and cold temperature conditions. The fitness values represent how well each genotype can survive and reproduce in a given environment: - In hot weather: - \(A_1A_1\) has the highest fitness value of 1.0. - \(A_1A_2\) has a fitness value of 0.8. - \(A_2A_2\) has the lowest fitness value of 0.5. - In cold weather: - \(A_2A_2\) has the highest fitness value of 1.0. - \(A_1A_2\) has a fitness value of 0.7. - \(A_1A_1\) has the lowest fitness value of 0.4. This illustrates the adaptive significance of the \(A_1\) and \(A_2\) alleles under varying environmental temperatures.
The A gene has two alleles: \(A_1\) and \(A_2\). The \(A_1\) allele improves fitness in hot weather, but it is deleterious when the weather is cold. The \(A_2\) allele improves fitness in cold weather and decreases fitness in hot weather. Use the fitness of each diploid genotype in the table below to answer the following questions. | | \(A_1A_1\) | \(A_1A_2\) | \(A_2A_2\) | |---------|-----------|-----------|-----------| | **Hot** | 1.0 | 0.8 | 0.5 | | **Cold**| 0.4 | 0.7 | 1.0 | **Explanation of the Table:** The table displays the fitness values of different genotypes (\(A_1A_1\), \(A_1A_2\), \(A_2A_2\)) under hot and cold temperature conditions. The fitness values represent how well each genotype can survive and reproduce in a given environment: - In hot weather: - \(A_1A_1\) has the highest fitness value of 1.0. - \(A_1A_2\) has a fitness value of 0.8. - \(A_2A_2\) has the lowest fitness value of 0.5. - In cold weather: - \(A_2A_2\) has the highest fitness value of 1.0. - \(A_1A_2\) has a fitness value of 0.7. - \(A_1A_1\) has the lowest fitness value of 0.4. This illustrates the adaptive significance of the \(A_1\) and \(A_2\) alleles under varying environmental temperatures.
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,...
Related questions
Question
please solve all:
a) In a hot environment, what do you expect to happen to the allele frequencies? Please explain your answer in 1-2 sentences.
b) In a cold environment, what do you expect to happen to the allele frequencies? Please explain your answer in 1-2 sentences.
c) If the environment fluctuates between hot and cold (spending half of the time in each condition), what do you expect to happen to the allele frequencies? Please explain your answer in 1-2 sentences.
Transcribed Image Text:The A gene has two alleles: \(A_1\) and \(A_2\). The \(A_1\) allele improves fitness in hot weather, but it is deleterious when the weather is cold. The \(A_2\) allele improves fitness in cold weather and decreases fitness in hot weather. Use the fitness of each diploid genotype in the table below to answer the following questions.
| | \(A_1A_1\) | \(A_1A_2\) | \(A_2A_2\) |
|---------|-----------|-----------|-----------|
| **Hot** | 1.0 | 0.8 | 0.5 |
| **Cold**| 0.4 | 0.7 | 1.0 |
**Explanation of the Table:**
The table displays the fitness values of different genotypes (\(A_1A_1\), \(A_1A_2\), \(A_2A_2\)) under hot and cold temperature conditions. The fitness values represent how well each genotype can survive and reproduce in a given environment:
- In hot weather:
- \(A_1A_1\) has the highest fitness value of 1.0.
- \(A_1A_2\) has a fitness value of 0.8.
- \(A_2A_2\) has the lowest fitness value of 0.5.
- In cold weather:
- \(A_2A_2\) has the highest fitness value of 1.0.
- \(A_1A_2\) has a fitness value of 0.7.
- \(A_1A_1\) has the lowest fitness value of 0.4.
This illustrates the adaptive significance of the \(A_1\) and \(A_2\) alleles under varying environmental temperatures.
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