الفهرس 
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Abstract
This investigation was carried out at Sakha Agricultural Research Station over three growing seasons of 2001, 2002 and 203. Four cotton varieties belonging to G. barbadense i.e. Giza 45, Giza 86,m Giza 89 and Karshinskii 2 were used n this study. The results revealed highly significant differences among L1, L2 and L3, triple test cross, families for all studied characters revealing presence of fair amount of genetic variability. Partitioning of epistasis to its component parts revealed that (i) type of epistasis, additive x additive, and (i+j) type, additive x dominance and dominance x dominance were significant for most studied characters in two triple test crosses. Additive gene effects played the important role in the genetic control of most studied characters. While the dominance gene effect was the predominant type in the inheritance of production rate index and fibre strength in both triple test crosses. The additive component of the genetic variation was larger in magnitude than the corresponding dominance ones for earliness characters and lint percentage as well as lint index, reflecting by high narrow heritabilities estimated. However, the dominance component was larger in magnitudes for lint yield/plant and boll weight in F3 generation