摘要：The toxic effects of formalin contaminated food (0% [control], 0.1%, 0.25%, 0.5% and 1% formalin) were evaluated on the reproductive cycle and lifespan of Drosophila malanogaster. The results showed a significant descendency in the number of progeny from F1 to F5 generation in case of 1% and from F1 to F4 in 0.5% formalin. The result was found significant decreasing of the percentage of survival up to reproduction in F1 to F3 with 0.25% formalin. The ingestion of formalin in diet reduces significantly the survival percentage population in F1 to F5 generations. The toxic effects in survival percentage were directly related to the concentration of formalin added. Different stages of life cycle of D. malanogaster shows developmental time of life cycle was lengthened with increasing concentration of formalin in F1 to F5. Significant diminishing of the percentage of survival in different treatments may cause of male sterility and detrimental effects on development of D. malanogaster. Formalin has a significant impact on the longevity of D. melanogaster and the experiments showed definite correlation where more the concentration of formalin was increased, the quicker the flies died. Female showed slightly longer lifespan than male but the result was insignificant.
