By Frank H. Ruddle
Genetic Mechanisms Of improvement, via Ruddle, Frank H., Ed
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Additional resources for Genetic Mechanisms of Development
Each secondary spermatogonium proceeds through 4 mitotic divisions giving rise to a total of 16 TABLE 1 TIMING OF SPERMATOGENESIS I N D. Day 1 2 3 4 5 melanogaster Events Stage Spermatogonia Four mitotic divisions Primary spermatocytes DNA Replication Y-loops formed Cell growth Meiosis 1 2 . 5 Nebenkern formation Elongation and differentiation Spermiogenesis Mature sperm in seminal vesicle «Based on the results of Chandley and Bateman (1962), Olivieri and Olivieri (1965), and A. Shermoen and B.
Biol. 8, 669-687. , and BAUTZ, E. (1969). Factor stimulating transcription by RNA polymerase. Nature (London) 221, 43-46. , and WASKELL, L. (1970). New RNA poly- merase from Escherichia coli infected with bacteriophage T7. Nature (London) 228, 227-231. , and KORNBERG, A. (1969). Biochemical studies of bacterial sporulation and germination. VIII. Patterns of enzyme development during growth and sporulation of Bacillus subtilis. J. Biol. Chem. 243, 4653-4660. , and IGARASHI, R. (1964). Genetic transcription during morphogenesis.
An exhaustive genetic analysis by Brosseau (1960) demonstrated the existence of at least 7 different fertility factors arranged in a linear sequence in the Y chromosome, and a series of papers by Meyer and Hess (reviewed in Hess and Meyer, 1968) and Hennig (1967, 1968) have described the activity of this chromosome in the spermatocyte nucleus. Cytological studies of spermiogenesis in Y-deficient males have been undertaken by Bairati and Baccetti (1966), Kiefer (1966, 1968, 1969, 1970), and Meyer (1968) in an attempt to determine the morphogenetic basis for sterility in these flies, and to ascribe specific functions to the Y chromosome.