Compare and contrast population and evolutionary effects on cystic fibrosis mutations and CCR5 mutations and whether these represent similar examples of genetic phenomena or are different with respect to natural selection in the human.
Question
Compare and contrast population and evolutionary effects on cystic fibrosis mutations and CCR5 mutations and whether these represent similar examples of genetic phenomena or are different with respect to natural selection in the human.
Solution
Cystic fibrosis (CF) and CCR5 mutations are both examples of genetic phenomena in humans, but they represent different aspects of natural selection.
Cystic fibrosis is a recessive genetic disorder caused by mutations in the CFTR gene. This disease is most common in people of Northern European descent, suggesting a population effect. The high frequency of CF mutations in this population has led to the hypothesis that carriers of the CF mutation may have had a selective advantage at some point in history. One theory is that carriers of the CF mutation were more resistant to cholera or other diarrheal diseases, providing a survival advantage.
On the other hand, the CCR5-Δ32 mutation, which provides resistance to HIV infection, is an example of an evolutionary effect. This mutation is also most common in people of Northern European descent, suggesting that it may have provided a selective advantage in the past. Some researchers believe that the CCR5-Δ32 mutation may have conferred resistance to the bubonic plague or smallpox, which were common in Europe in the past.
While both CF and CCR5 mutations can be seen as examples of natural selection in action, they represent different types of selection. CF mutations may represent balancing selection, where the selective advantage of being a carrier balances out the disadvantage of having the disease. In contrast, the CCR5-Δ32 mutation represents positive selection, where the mutation provides a clear survival advantage.
In conclusion, while both CF and CCR5 mutations are examples of genetic phenomena influenced by natural selection, they represent different types of selection and have different population and evolutionary effects.
Similar Questions
Which one of the following statements is TRUE about Cystic Fibrosis (CF)?Group of answer choicesCF exhibits a recessive pattern of inheritance, where, in simple terms, two copies of the mutated gene are required for the disease to occur.CF exhibits a dominant pattern of inheritance, where, in simple terms, two copies of the mutated gene are required for the disease to occur.CF exhibits a dominant pattern of inheritance, where, in simple terms, only one copy of the mutated gene is required for the disease to occur.CF exhibits a recessive pattern of inheritance, where, in simple terms, only one copy of the mutated gene is required for the disease to occur.
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