The results show that different wavelengths differentially affect tilapia and ram sperm motility and fertilization. The difference in response to the various light sources might be explained by the different amounts of ROS formation by ram and tilapia, which are in agreement with the physiology of fertilization appropriate to each of these species. Based on these results, it is suggested that in vitro fertilization in mammals should be performed in darkness or at least under red light.
A-ew Pork, X . r I n previous papers the existence of male sterility in the house mouse caused hy the combination of diff erent recessive mutations of the t type was reported (Eryson, '44; Dunn and Gluecksohn-Schoenheimer, '43). These mutations all occur in one linkage group (no. TX) and do not show any crossing o r e r with each other. Three of them have been shown to suppress crossing over in a region of 1-5 crossover units in chromosome IX and they all are probably coniiected with chromosonial rearrangernents of one kind or another.The first mutation of this kind to be discovered was t o (Chesley and Dunn, '36). I n combiiiatioii with T (dominant short tail mutation) it produces taillessness, while in homozygous condition ( t " / V ) it is lethal and t O / P embryos die soon after implantation in the uterus. another recessive mutation related closely to t" is tl ; it also produces taillessness in combination with T and is lethal when homozygous, the tl/fl zygotes d j k g even before implantation ; the combination t"/t', however, resnlts in normal tailed progeny (Dunn, '37). While such normal tailed females t o / t l breed normally, the males are sterile (Dunn arid Gluecksoliii-Schoenheimer, '43). 9 third mutation in this series (t') turned out to be identical with t' (Dunn, '39). Recently, still another mutation in this series ( P I was analyzed. It also produces taillessness in conibinanation with T a i d does not show any crossing over with the other mutatioiis in the l' series, lout the homozygotes ( i 3 / t 3 )
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