قارن الطرق

	اختبار ماكدونالد-كرايتمان	إحصائيات F (FST)	اختبار HKA
المجال	علم الوراثة	علم الوراثة	علم الوراثة
العائلة	Process / pipeline	Process / pipeline	Process / pipeline
سنة النشأة	1991	1951	1987
صاحب الطريقة	James McDonald & Martin Kreitman	Sewall Wright	Richard Hudson, Martin Kreitman & Montserrat Aguade
النوع	Hypothesis test	Population differentiation measure	Statistical test
المصدر التأسيسي	McDonald, J. H., & Kreitman, M. (1991). Adaptive protein evolution at the Adh locus in Drosophila. Nature, 351(6328), 652–654.	Wright, S. (1951). The genetical structure of populations. Annals of Eugenics, 15(4), 323–354.	Hudson, R. R., Kreitman, M., & Aguadé, M. (1987). A test of neutral molecular evolution based on nucleotide data. Genetics, 116(1), 153–159.
الأسماء البديلة	MK test, Positive selection test	FST, Wright's F-statistics, Population differentiation index	HKA test, Polymorphism divergence test
ذات صلة	4	4	4
الملخص	The McDonald-Kreitman (MK) test is a statistical method for detecting adaptive evolution by comparing ratios of synonymous and nonsynonymous substitutions within and between species. Developed by James McDonald and Martin Kreitman in 1991, this test exploits the key insight that neutral mutations accumulate at similar rates within and between species, while adaptive (nonsynonymous) substitutions should be enriched between species if they have been fixed by positive selection. The MK test has become a standard tool in molecular evolutionary biology for identifying genes under natural selection.	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.	The Hudson-Kreitman-Aguade (HKA) test is a statistical method that tests for neutral evolution by comparing levels of within-population polymorphism and between-population divergence at multiple loci. Developed by Hudson, Kreitman, and Aguade in 1987, this test uses the principle that neutral loci should show expected relationships between polymorphism and divergence. Loci deviating from these relationships are candidates for selection. The HKA test is particularly useful for detecting selection in genome-wide surveys because it uses relative comparisons across loci rather than requiring external calibration.