用果蝇探查火箭飞行因素的生物遗传效应的实验结果

用黑腹果蝇检查T_(7A_S1)火箭飞行因素的遗传效应。通过两次飞行实验观察,发现亲代雌蝇在飞行后(主要是第4—6天)所产的卵中,无X染色体卵百分率增高而双X染色体卵百分率未见变化。其性质并非个别雌蝇产生了较多的无X染色体卵,而是产生无X染色体卵的雌蝇个数增多。第二次飞行实验结果也呈现,亲代雌蝇在飞行后第4—6天所产的子1代中,三龄幼虫成神经细胞染色体桥频率增高。上述实验结果表明,火箭飞行因素对雌果蝇生殖细胞遗传物质有轻微影响。

RESULTS OF EXPERIMENTS ON THE EXPLORATION OFGENETIC EFFECT OF ROCKET FLIGHT FACTORSWITH DROSOPHILA MELANOGASTER

Observations on two tests in exploring genetic effect of the factors of T7A-S1 rocket flight with drosophila melanogaster show that the percentage of the eggs without X-chromo-some is increased and the percentage of the eggs with double X-chromosomes is not changed in the total number of eggs laid by female parents in the days after flight (mainly the fourth to sixth). The character is not that one or two individual laid a larger number of eggs without X-chromosome, but that there is an increase in the number of female parents laying those eggs. The result of test in the second flight shows that the percentage of chromosome bridge in the neuroblasts of the third instar larvae of the first filial generation produced by female parents in the fourth to sixth day after flight is increased. The above results prove that the genetic materials of reproductive cells of female parents are slightly affected.