Studies on Cytology and Differentiation in Sciaridae. I. Chromosome Changes Induced by a Gregarine inTrichosia Sp.(Diptera, Sciaridae)

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Abstract
This paper reports chromosomal changes induced by a gregarine in the parasitized caeca cells of Trichosia sp. The chromosomes of the host cells grow to abnormal sizes and present constrictions and breaks. The polytene chromosomes dissociate producing polyploid nuclei. There are also differential effects on the autosomes and X-chromosome. The system host cell- gregarine here reported is very favorable for studies on the regulation of chromosome metabolism as well as for the understanding of chromosomal effects of pathological agents.