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Answer to Question #60586 in Evolution for Sanjukta Ghosh

Question #60586
How does genetic drift result into evolutionary divergence? Could you explain with an example?
Expert's answer
Because of genetic drift, the variance between demes (small subpopulations) increases over time (i.e., demes will diverge, esp. if they become isolated).
Given enough time, allele A or a will become fixed (p = 1 or p = 0).
The allele that is already more frequent will have a higher probability of being fixed:
The probability of a ("neutral") allele is its frequency (= 1/(2N) for a single gene copy).
Thus, the main features of genetic drift are:
a. A loss of genetic variation results within populations
b. Genetic divergence results between populations
c. Evolution results (i.e., allele frequencies change, until H = 0)

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Comments

Sanjukta Ghosh
29.06.16, 17:00

If you don't mind what is H? (I didn't use the question panel because it is a follow-up question and using the ques-panel will make it appear unconnected.)

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