The Fixation Index, commonly referred to as FST, is a measure used in population genetics to quantify the degree of genetic differentiation between populations. Specifically, it reflects the proportion of genetic variance that can be attributed to differences between populations compared to the total genetic variance within and among those populations. FST values range from 0 to 1: - An FST of 0 indicates that there is no genetic differentiation between populations, suggesting that they are genetically identical or very similar.
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