THE DEPENDENCE OF VIABILITY EFFECTS CAUSED BY IRRADIATION ON THE TYPE OF MATING
Journal Article
·
· Proceedings of the National Academy of Sciences of the United States of America
The daughters of irradiated males and unirradiated control males were mated individually to two types of males of Drosophila melanogaster. The viability of males hemizygous for the irradiated chromosomes and of females heterozygous for the irradiated chromosomes was determined together with the corresponding control values. While the viabllity of males hemizygous for irradiated chromosomes was always reduced, the viability of females heterozygous for irradiated chromosomes was either reduced or increased, depending on the type of mating. Intraculture competition differences were demonstrated to be responsible for the difference between matings. The heterotic effect was observed whenever the females heterozygous for the irradiated chromosome were able to replace the decline in the number of males hemizygous for irradiated chromosomes. The observed heterosis was therefore spurious, in that it was not in fact the effect of a viability of the heterozygote superior to that of either homozygote. It is suggested that some previous reports on differences in mutability between types of crosses or on heterosis of flies heterozygous for induced mutations were also caused by intraculture competition. (auth)
- Research Organization:
- Hebrew Univ., Jerusalem
- Sponsoring Organization:
- USDOE
- NSA Number:
- NSA-17-028748
- OSTI ID:
- 4713041
- Journal Information:
- Proceedings of the National Academy of Sciences of the United States of America, Journal Name: Proceedings of the National Academy of Sciences of the United States of America Journal Issue: 3 Vol. 49; ISSN 0027-8424
- Publisher:
- National Academy of Sciences, Washington, DC (United States)
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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