Abstract
MEIOSIS in the males of the higher Diptera is characterized by absence of chiasmata. This means that as a rule genetical crossing-over occurs only in females. There are, however, a few exceptional families in Drosophila melanogaster1,2 and virilis3, the constitution of which can only be explained as due to crossing-over in the father. In these cases the exceptional offspring occurred in batches rather than singly. It was therefore supposed that crossing-over had taken place in one of the early spermatogonial divisions, though there is no cytological basis for this assumption.
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References
Muller, Amer. Nat., 50 (1916).
Friesen, Biol. Zbl., 54 (1934).
Kikkawa, Proc. Imp. Acad. Japan, 9 (1933).
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PHILIP, U. Crossing-over in the Males of Drosophila subobscura. Nature 153, 223 (1944). https://doi.org/10.1038/153223a0
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DOI: https://doi.org/10.1038/153223a0
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