This study was conducted to find out the effect of 5 periods of exposure to laser rays (0,15,10,5,20) minutes on the phenotypic mutations of Drosophila melanogaster, as well as calculating the percentage of mortality and the percentage of larval failure. The results showed that laser beams had significant effects in causing mutations, especially in the 15-minute period, which amounted to 0.33 and thus formed significant differences compared to the control group. The periods of exposure to laser rays also caused clear effects in the rate of larval mortality, as the death rate was 100% for the period of 20 minutes, while this rate decreased to 27% and 34% for the periods 5 and 10 minutes, respectively, while the lowest failure rate was 0% at the period 20, which led to the death of all the larvae.

This research was designed for the purpose of studying the effect of 5 periods of exposure to infrared radiation (0,5,10,20 and 30) minutes on the product of phenotypic mutations of housefly: musca domestica by calculating the percentage of abnormalities, which included distortions of wings and tentacles, small body size, depreciation rate and rate emergence rate for adults. The results showed that the infrared radiation had significant effects in causing deformations, especially in the period 20 and 30 minutes, while the exposure periods caused clear effects in the larval mortality, where the highest mortality rate reached 72% for the period 30 minutes. While this rate decreased to 15% and 19% for periods 5 and 10 min. respectively, and thus formed significant differences as a compared with the control group, while the lowest percentage of emergence was 18% at period 30, which led to a decrease in rate of adults emerging.

This study aimed to study chromosomal changes for people who eat frozen meat, the samples were collected from 30 people (males) aged 20-25 years from three different regions, they divided between , the city center and districts and rural areas in addition to control group who were 10 healthy people in the same sex and age and didnt eat frozen meat. Were prepared chromosomes from lymphoid peripheral blood cells, and then calculated changes in the chromosomes . The results of the study showed the presence of abnormalities in the chromosomes of people who lives in city center(third group) as compared to control where it reached 0.13 , but this different was not significant at the level (p <0.01) changes of chromosomal aberration in first and second groups were 0.11 , 0.09 , but did not constitute significant differences. The types of malformations observed in the chromosomes of the study samples included : chromatide breack, chromatide delete , acentric fragmentes showed no numerical changes in the studied groups.