QQuestion
Question
"Q^4.9. The allele for black noses in wolves is dominant over the allele for brown noses. There is no known selective advantage for one nose color over another in wolves. If this remains true, which of the following statements is most likely true about the change in wolf nose colors over many generations?
A. Black noses will become more common than they are now.
B. Black noses will stay about the same frequency as now.
C. Black noses will become less common than they are now.
D. Brown noses will disappear after enough generations pass."
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Answer
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Step 1
Since the allele for black noses is dominant over the allele for brown noses, black noses will always be at least as common as brown noses in any given generation. This is because an individual with one black nose allele and one brown nose allele will have a black nose, and they can pass either allele on to their offspring.
Step 2
If there is no known selective advantage for one nose color over another, then the frequency of these alleles should remain relatively stable over time, assuming a large and randomly mating population. This is because the forces of genetic drift, mutation, and gene flow would counteract any slight changes in allele frequency due to selection.
Final Answer
Given the information above, we can conclude that black noses will stay about the same frequency as they are now, and brown noses will not disappear. Therefore, the most likely answer is: B. Black noses will stay about the same frequency as now. It's important to note that this answer assumes a large, randomly mating population and the absence of other factors that could influence allele frequencies, such as genetic drift, mutation, or gene flow. In a smaller or non-randomly mating population, the frequency of these alleles could change over time due to genetic drift or inbreeding.
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