Genetic behavior of F₁ and F₂ for some economic traits in cotton crosses [electronic resource].

Includes references.

Genetic analysis of F₁ and F₂ was employed to investigate the nature of genetic system controlling inheritance of some yield, yield components and fiber properties traits in six cotton varieties by half diallel crosses. The data cleared that all genotypes differed significantly from each other for all studied traits. Wr/Vr regression coefficients were significantly different from unit slop indicating the presence of dominance as well as over dominance in the two generations for yield components and fiber quality traits except for fiber length, fiber strength and color + b in F₁ only. The information obtained with regard to D and H₁ suggested that additive part of the genetic variance was less important than dominance concerning gene distribution, for all studied traits in the two generations. Most of dominant genes had positive direction in all traits except for lint percentage in F₁ and upper half mean in F₂, the positive sign indicates an excess of dominant alleles of dominant effects on the parents. Dominance degree was over dominance for all traits except for fiber fineness as well as fiber strength in F₂ exhibited no dominance. The graphical analysis which showed that the parent Giza 93 had most dominant alleles while, Giza 86 possess recessive genes for most studied traits as well as, the regression line deviates significa_ntly from unit slop indicating some non-allelic interactions and it touched Wr axis above or below the origin as a resulted partial dominance or over dominance type of gene action were controlled the inheritance of these traits in F₁ and F₂ generations.

Summary in Arabic.

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