An Apparent Case of Monocentric Mitosis in Sciara (Diptera)

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Abstract
A striking and unusual mitotic figure for the 1st spermatocyte is reported, in which the diploid, but unsynapsed, chromosomes regularly segregate without division to opposite sides of the cell[long dash]6 to the polar and 4 to the apolar. A very unequal cell division follows. Incident to these processes are the following facts: All chromosomes are attached to fibers, although 4 proceed away from the pole along divergent paths. There are no asters and no equatorial plate. The chromosomes of the group of 4 differ in appearance from the 6. There are no abnormal conditions of chromosome structure or fiber attachment. The conditions seem to suggest a tractive force on the chromosomes exerted through the fibers, which, in the case of the 4, is overcome by some opposing influence, possibly electrical.

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