srjalsSRJALSSRJALS2788-9386https://doi.org/10.47310/srjals.2022.v02i02.020Synthetic Varieties, its Composition, Deduction and Evaluation Comparing with its Fore ParentsSaifuldeenAhmedHasanMuntasserKhudhurSahiRaeedMejbelAbdullahShatrah Technical Institute, Southern Technical University, IraqCollege of Health And Medical Techniques, Kirkuk, Northern Technical University, IraqIt is known that the best genotype to produce the highest yield in the mixture of pollination, it is the hybrid and then the synthetic variety, due to the weakness of hybrid production technologies in Iraq, necessary to produce synthetic items, which has a good percentage of hybrid strength, keep production for 4-5 years or more, if there was no genetic confusion or deterioration in it as a result of an external cause, as the hybrid yield decreased in the second generation, based on a loss of 50%, 33% and 25% of the hybrid vigor, if the hybrid was dichotomous, triplet or tetraploid in succession, according to Hardy-Weinberg's law. It is very necessary when devising synthetic varieties, determining the optimum number of strains that are included in their development, Polycross, to improve its genetic base, increasing the production capacity to ensure the benefit of the hybrid power in its ability to combine, as self-pollination and multiple crosses, helps focus the desired genes, a number of important traits that are already present in the breeds are combined in one genotype.