Download Insect Accessory Reproductive Structures: Function, by M.S. Kaulenas PDF

By M.S. Kaulenas

In retrospect, the diversity of subject matters coated during this monograph, even if forming a coherent ensemble, is so huge specific dialogue may well simply expand to 3 or 4 occasions the present size. My method has been to spot the serious concerns, summarize the most important accomplishments, and to signify promising avenues for destiny learn. To facilitate this sumĀ­ mary presentation, i've got restricted the literature evaluate mostly to fabric released after 1970, extending to fabric showing past due in 1990. I gratefully recognize the recommendation of many colleagues, fairly the precious criticisms of Drs. Warren Burggren, Joseph Kunkel, Randall Phillis, and John Stoffolano. I additionally desire to thank Mrs. Elizabeth Brooks for secretarial advice. eventually, thank you are because of Dr. D. Czeschlik and his employees at Springer Verlag for his or her persistence and aid. Amherst, MA, October 1991 M. S. KAULENAS V Contents bankruptcy 1 creation . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 bankruptcy 2 The Reproductive Elferent Duct structures and linked constructions. improvement and Genetic regulate of Differentiation . . . . . . . . . . . . . . . . . . . . . . . . . five 2. 1 foundation of the Germ Cells and linked Cells and Tissues . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . five 2. 2 Differentiation of the Efferent Duct approach and linked buildings . . . . . . . . . . . . . . . . . . . nine 2. 2. 1 The Male method . . . . . . . . . . . . . . . . . . . . . . . . . . . nine 2. 2. 2 the feminine method . . . . . . . . . . . . . . . . . . . . . . . . . thirteen 2. three Genetic keep an eye on of Sexual Differentiation . . . . . sixteen 2. three. 1 Daughterless. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 2. three. 2 intercourse decision: size of the X:A Ratio. . . . . . . . . . . . . . . . . . . . . . . . . . 20 2. three. three intercourse deadly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 2. three. four Genes Controlling Somatic Sexual Differentiation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 2. three. five Dosage repayment . . . . . . . . . . . . . . . . . . . . . .

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Extra info for Insect Accessory Reproductive Structures: Function, Structure, and Development

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As in Sxl and tra, there is a "default" pattern found in males, which appears to require only the basic cellular splicing machinery, and an alternative splicing pattern found in females. At the sequence level, the male acceptor splice sites are good matches to the Drosophila consensus, but the female 3'-splice site is a poor match. It is reasonable to suppose that modified or additional components may be necessary to achieve the female splice. Analysis of mutations which disrupt the regulation of dsx RNA processing indicate that sequences in the female specific exon are important for the regulation of sex-specific RNA splicing (Nagoshi and Baker 1990).

The squamous cells covering the nurse cells and the border cells lose their yolk protein content before mid-vitellogenesis; the columnar cells over the oocyte continue to react to yolk protein antiserum until late vitellogenesis. All follicle cells are immunonegative after this point in development. In vitro translation of isolated mRNA shows that mRNA content correlates well with immunopositivity for yolk proteins in the follicle cells. In Musca domestica, at the start of vitellogenesis, the fat body appears to be the main site of yolk protein synthesis; later the dominant role is taken over by the ovaries (De Bianchi et a!.

1987) demonstrating the effect of Sxl transcripts on the splicing of tra RNA. A A chimeric plasmid, containing an inserted copia promoter (solid box), and the tra gene (vertical striped box), functions in Kc cells to produce non-sex-specific tra RNA. } when the Sxl cDNA is of the female-specific type, the tra RNAs detected include non-sex-specific and female-specific types. 2 When the Sxl cDNA is a mixture of male and female specific types, the Ira RNA detected include non-sex-specific and female-specific types.

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