الفهرس 
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Abstract
Studies on the nature of genetic variability and genetic divergence in cotton (gossypium barbadense, l). dissertation abstract cotton improvement requires the ability to select high performance individuals requires more variation. This usually overcome by crossing unrelated strains to create the genetic variation through recombination’s followed by selection. Therefore, the detects and estimates of genetic variation and genetic divergence among various genotypes were more important for cotton breeder. Hence, the brief literature relating to the present study is Success of cotton breeding and improvement program depends up on the genetic variability which presented in the population under study. The knowledge about the nature and magnitude of genetic effects prevailing in the material is necessary to decide about the kind of breeding procedures to be chosen. The present study was done in the Agronomy Department, Faculty of Agriculture, Mansoura University. The investigation was carried out at Sakha Agriculture Research Station, ARC Egypt, during 2015 and 2016 growing seasons. The eight parents were crossed in a half diallel fashion during crop season of 2015 to produce twenty eight F1 hybrid seeds. The 28 F1 hybrids and their parents were grown in a randomized complete block design (RCB) with three replicates during 2016 season. Each experimental plot consisted of one row, measuring five meter in length and 0.70m in width, with plants spaced 0.30m within row. Two plants were left per hill at thinning time. Recommended cultural practices were followed for all the entries. Ten guarded plants of each plot were ginned and used to determine yield and fiber characters