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31 Jul 2018
2. Consider a new mutant arising in a finite population.
a. Compare the length of time required to fix or lose this new mutation by selection vs.
genetic drift.
-> Selection is generally faster than drift, even when weak.
b. How does your answer help explain why most polymorphisms are selectively
neutral?
-> Since mutations under selection are resolved quickly, few contribute to standing
variation. The only ones that remain at intermediate frequencies are those that are
selectively neutral.
Could you explain the answers to these questions to me a little clearer? It seems to me the natural selection should occur at a slower rate than drift, but this is not the case.
2. Consider a new mutant arising in a finite population.
a. Compare the length of time required to fix or lose this new mutation by selection vs.
genetic drift.
-> Selection is generally faster than drift, even when weak.
b. How does your answer help explain why most polymorphisms are selectively
neutral?
-> Since mutations under selection are resolved quickly, few contribute to standing
variation. The only ones that remain at intermediate frequencies are those that are
selectively neutral.
Could you explain the answers to these questions to me a little clearer? It seems to me the natural selection should occur at a slower rate than drift, but this is not the case.
Patrina SchowalterLv2
3 Aug 2018
