قارن الطرق

	إعادة بناء الحالة السلفية	إحصائيات F (FST)
المجال	علم الوراثة	علم الوراثة
العائلة	Process / pipeline	Process / pipeline
سنة النشأة	1991	1951
صاحب الطريقة	Wayne Maddison	Sewall Wright
النوع	Inference method	Population differentiation measure
المصدر التأسيسي	Maddison, W. P. (1991). Squared-change parsimony reconstructions of ancestral states for continuous-valued characters on a phylogenetic tree. Systematic Zoology, 40(3), 308–314.	Wright, S. (1951). The genetical structure of populations. Annals of Eugenics, 15(4), 323–354.
الأسماء البديلة	ASR, Ancestral character reconstruction, Trait reconstruction	FST, Wright's F-statistics, Population differentiation index
ذات صلة	3	4
الملخص	Ancestral state reconstruction (ASR) is a phylogenetic method that infers the character states (trait values or evolutionary features) of extinct ancestors by analyzing patterns of variation in extant (living) species. Developed by Wayne Maddison and colleagues in the 1990s, ASR uses the phylogenetic tree and observed trait variation in living species to estimate what ancestors possessed, enabling researchers to trace the evolutionary history of morphological, behavioral, ecological, and genomic traits.	F-statistics are a family of measures developed by Sewall Wright to quantify population genetic structure and the degree of genetic differentiation between populations. FST, the most widely used F-statistic, measures the proportion of total genetic variation attributable to differences between populations versus within populations. FST ranges from zero (no differentiation) to one (complete differentiation). These statistics have become fundamental tools for understanding population structure, detecting population admixture, and analyzing the evolutionary forces shaping genetic variation.