Abstract
The karyotypic variation of a cell line (K C ) established from primary cultures of embryonic cells of Drosophila melanogaster was studied. Aneuploidy and structural rearrangements were found consisting mainly in: 1) loss of one of the chromosomes of the IV pair, 2) presence of a heterochromatic centric fragment (Y ?), 3) enlargement of the heterochromatic portion of one X, 4) shortening of an arm of one element of the two large autosome pairs. Moreover, the presence of tetraploid cells (3–12%) was noticed. The polymorphism in this cell population can be explained as a result of different mechanisms, including hybridization between different cell types. Replication of DNA was studied by autoradiography with special reference to the timing of replication of heterochromatin.
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