Early prophase in female meiosis of Drosophila melanogaster. Further studies

Dåvring, Lars; Sunner, Margareta

doi:10.1111/j.1601-5223.1976.tb01548.x

Cited by 14 publications

(2 citation statements)

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“…The work done in our laboratory (DAVRING andSUNNER 1973, 1976) and also the work of NOKMLA and PURo ( 1976) have shown that this material is not so completely refractory as was earlier believed. We hope that our studies will stimulate further cytological analysis of the female Drosophila.…”

Section: Discussionmentioning

confidence: 89%

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Late prophase and first metaphase in female meiosis of Drosophila melanogaster

Dåvring

Sunner

2009

Hereditas

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Details of the critical stages that precede the appearance of the metaphase bivalents in the female Drosophila melunogaster were studied in a comparison between whole-mount preparations and squash preparations. At the end of stage S,, the nuclear membrane breaks down, and the bivalents leave the chromocenter and become orientated on the first meiotic spindle. In stage S,4 a metaphase 1 plate with separate bivalents is formed. A renewed survey of female meiosis in Drosophila melanogaster in relation to egg follicle stages is presented.

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Section: Discussionmentioning

confidence: 89%

“…Female flies used in this work were of the same stock, derived from wild-type Canton-S, and were raised under the same cultural conditions as has been earlier reported (DAVRING andSUNNER 1973, 1976). In the present experiments, ovaries of flies older than 24 hours after eclosion, were dissected out in a drop of Ringer's solution.…”

Section: Methodsmentioning

confidence: 99%

Late prophase and first metaphase in female meiosis of Drosophila melanogaster

Dåvring

Sunner

2009

Hereditas

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Genetic studies on heterochromatin in Drosophila melanogaster and their implications for the functions of satellite DNA

1978

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In Drosophila melanogaster the centromeric heterochromatin of all chromosomes consists almost entirely of several different satellite DNA sequences. In view of this we have examined by genetic means the meiotic consequences of X chromosomes with partial deletions of their heterochromatin, and have found that the amount and position of recombination on each heterochromatically deleted X is substantially different from that of a normal X. It appears that the amount of heterochromatin is important in modifying the "centromere effect" on recombination.--In all the deleted Xs tested, chromosome segregation is not appreciably altered from that of a nondeleted control chromosome. Thus satellite DNA does not appear to be an important factor in determining the regular segregation of sex chromosomes in Drosophila. Additionally, since X chromosomes with massive satellite DNA deficiencies are able to participate in a chromocenter within salivary gland nuclei, a major role of satellite DNA in chromocenter formation in this tissue is also quite unlikely.--In order to examine the mechanisms by which the amount of satellite DNA is increased or decreased in vivo, we have measured cytologically the frequency of spontaneous sister chromatid exchanges in a ring Y chromosome which is entirely heterochromatic and consists almost exclusively of satellite DNA. In larval neuroblast cells the frequency of spontaneous SCE in this Y is approximately 0.3% per cell division. Since there is no meiotic recombination in D. melanogaster males and since meiotic recombination in the female does not occur in heterochromatin, our results provide a minimum estimate of the in vivo frequency of SCE in C-banded heterochromatin (which is predominantly simple sequence DNA), without the usual complications of substituted base analogs, incorporated radioactive label or substantial genetic content.--We emphasise that: (a) satellite DNA is not implicated in any major way in recognition processes such as meiotic homologue recognition or chromocenter formation in salivaries, (b) there is likely to be continuous variation in the amount of satellite DNA between individuals of a species; and (c) the amount of satellite DNA can have a crucial functional role in the meiotic recombination system.

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Investigations on radiosensitive and radioresistant populations of Drosophila melanogaster VIII. The system of relative radioresistance in immature oocytes of the irradiated population RÖI4

Nöthel

1981

Mutation Research/Fundamental and Molecular Mechanisms of Mutag

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Early prophase in female meiosis of Drosophila melanogaster. Further studies

Cited by 14 publications

References 1 publication

Late prophase and first metaphase in female meiosis of Drosophila melanogaster

Late prophase and first metaphase in female meiosis of Drosophila melanogaster

Genetic studies on heterochromatin in Drosophila melanogaster and their implications for the functions of satellite DNA

Investigations on radiosensitive and radioresistant populations of Drosophila melanogaster VIII. The system of relative radioresistance in immature oocytes of the irradiated population RÖI4

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