Abstract

ADULT members of the gall midges (Cecidomyidae, Diptera) are characterized by possessing a large number of chromosomes in their germ-line cells and a small number in their somatic cells1. This difference is established during one or more of the early mitotic divisions when a large but species-specific number of chromosomes is eliminated from all the nuclei destined to form the soma. Elimination is caused by the failure of the majority of the pairs of chromatids to leave the equatorial plate at mitosis.

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