Abstract
The influence of heat shock on the puffing pattern of salivary gland polytene chromosomes of D. auraria from five developmental stages was investigated. Under heat shock conditions, seven puffs appear to be transcriptionally active, five of which are active during normal development as well. Two sublines of D. auraria, differing in the activity of one of the Balbiani rings known to exist in this species, also differ clearly in the size and the transcriptional activity of a puff (64B) which is induced by heat shock in one of the sublines, but not in the other; the polytene chromosomes of the hybrids between the sublines do not exhibit this puff under heat shock conditions.
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