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The present study aims at examining some hereditary effects (sterility and fertility) in sampled Iraqi families. The study includes 1000 families chosen from different areas. The samples are randomly chosen and from different cultural levels. The results show that there are normal differences in the ratio of the influencing factors on reproduction, such as fertility and sterility among foreign married and consanguineous ones. The high rate is found in the first step Consanguineous marriage where it reaches 3.5 (9.2-7.9X2) with the possibility of 0.05 free degree for the first and the second steps as compared with the foreign marriage. The ratio of the spontaneous abortion, the embryo death and the child death under the age of two years are high as compared with the rate of the foreign marriage which are as follows: (22.1), (3.3) and (5.2) respectively (valued 6.8-8.3X2) with the possibility of 0.05 free degree. Also, it is noticed that the ratio of the reproduction disorder of the sample under study is 53%, which is high as compared with the rate of the other studies that were carried out in Iraq. Also, it has been seen that there is a decrease in the internal marriage factor (F=0.27) and the ratio of Consanguineous marriage in this study is 56.6%, which is high as compared with other studies. This is evidence that the heredity danger awareness from the consanguineous marriage is below the required level.
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