Abstract
The 10 autosomes of Musca domestica L. ocra strain are somatically paired and each pair is cytologically recognizable. Thymidine-methyl-H3 incorporation into the third instar larval brain cells and subsequent autoradiography revealed that the co-labelling index for the two homologues of a pair appears to be correlated to some extent with the labelling rate for that particular pair. The homologues are often but not always labelled at the same time, even when all the autosomal pairs have a high labelling rate. Thus, there does not seem to be strict synchrony of DNA replication for the two homologues of a pair.
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