Viability of heterozygotes for induced mutations in Drosophila melanogaster I. Irradiated X-chromosome

VIABILITY OF HETEROZYGOTES FOR INDUCED MUTATIONS IN DROSOPHILA MELANOGASTER. II. MEAN EFFECTS IN IRRADIATED AUTOSOMES

“…This is in contrast to our finding in the previous. studies with the X chromosome (FALK, RAHAT and BEN-ZEEV 1965), but is in accord with that of other recent studies (%FER 1953;BONNIER and JONSSON 1957;GREENBERG and CROW 1960;FRIEDMAN 1964).…”

“…We may now compare the effects of the radiation, found in this study, with those found by FRIEDMAN ( 1964) and in our previous study ( FALK, RAHAT and BEN-ZEEV 1965)-see Table 8. The frequency of lethal equivalents per roentgen induced in the second chromosome, in the present study, was roughly twice that induced in the X chromosome in the other two studies; this is the ratio expected from the relative length of the second and X chromosomes.…”

“…In spite of the extensive deleterious effects induced in the irradiated chromosomes, the viability of heterozygotes for these chromosomes was not significantly effected. In our previous studies (FALK 1961 ;FALK, RAHAT and BEN-ZEEV 1965) there were indications for a deleterious effect on viability of heterozygotes for irradiated chromosomes. The present experiments were designed so as to improve 03 the earlier ones.…”

“…Many of the difficulties of the previous series of experiments (FALK, RAHAT and BEN-ZEEV 1965) have been overcome in the present experiments. If there was a specific reaction of the X chromosome to induced viability mutations, it was eliminated in the present experiment.…”

Yield and Variability of Chlorophyll-Mutant Heterozygotes in Barley

“…A number of investigations concerning the viability, yield, variability, or other quantitative traits of heterozygotes for recessive lethal genes have been carried out; for a survey see FALK, RAHAT and BEN-ZEEV (1965) and HAGBERG (1953). Some of these investigations have dealt with lethal genes in plants, e.g.…”