Abstract
The puffing pattern in salivary chromosomes of third instar larvae ofDrosophila hydei was studied following treatment with various gases, potassium cyanide, or vacuum. It was found that a number of specific puffs appear when anaerobiosis is followed by exposure to air or oxygen. These puffs seem to be independent of larval age, and are identical with some of those puffs which can be induced by raised temperature. It is suggested that the chromosomal loci involved, are connected with respiration.
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