THE OCCURRENCE OF X-RAY INDUCED DOMINANT LETHAL MUTATIONS IN HABROBRACON
نویسندگان
چکیده
منابع مشابه
The Occurrence of X-Ray Induced Dominant Lethal Mutations in Habrobracon.
H E PARASITIC wasp, Habrobracon, has been considered of special T value in connection with studies of dominant lethals because of its somewhat exceptional method of breeding. In “out-crosses,” now called three-allele crosses because they involve triple alleles a t the sex locus, all fertilized eggs develop into females, unfertilized ones into males (WHITING 1937a, 1940, 1943). It follows, then,...
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HE technique for classifying oocytes of irradiated females of the parasitic Twasp, Habrobracon, into those exposed in first meiotic prophase (prophase I ) and those exposed in first meiotic metaphase (metaphase I) was described by the author in 1945 (1945a). Methods for greater accuracy in estimating lethal rates were described by ATWOOD, VON BORSTEL and WHITING 1956. The striking difference in...
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ULLER in 1927 stated that the “partial sterility” of X-rayed males M of Drosophila wasdue,at least to an appreciable extent, to dominant lethal changes induced in the sperm. It was impossible, however, to determine whether the eggs were actually “fertilized.” In Drosophila the result would be the same; the eggs would fail to develop, whether dominant lethals were induced or the sperm were inact...
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P A R T of the genetic damage induced by X rays may be due to mutations which have harmful effects on viability. Such mutations may vary in the seventy of their effects from lethal to mildly detrimental, and in degree of dominance from completely dominant or overdominant to completely recessive. The difficulties of obtaining precise mutation rate estimates for viability mutations in mammals are...
متن کاملAn Influence of Ploidy on the Time of Expression of Dominant Lethal Mutations in Habrobracon.
HEN Habrobracon eggs are X-rayed at metaphase I and subsequently fertiw l i z e d , the decreased hatchability is attributed to dominant lethal mutation, in the same sense in which the term is used when sperm are irradiated. This is justified by WHITING'S demonstration (1946, 1948, 1949, 1950, 1955) that cytoplasmic injury is not lethal a t the doses employed. In unfertilized eggs, which develo...
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ژورنال
عنوان ژورنال: Genetics
سال: 1945
ISSN: 1943-2631
DOI: 10.1093/genetics/30.2.197