Abstract
SUMMARYAnalysis of 15 asymmetric bands, visible in the polytene chromosomes of Sciara ocellaris, showed that these structural modified chromomeres are transmitted as Mendelian entities obeying the Sciarid's special meiotic mechanism. From the genotypic proportion scored in F1 larva of single pair matings, it was ascertained that the selective elimination of chromosomes, typical of sciarid flies, do occur for all the autosomes in this species. Selective segregation for X-linked genes was shown before. Some discrepancies in the transmission of one specific chromomere was found and could not be explained by differential viability of homozygotes and heterozygotes for this band. Other mechanisms must be influencing the transmission of some of these structured modified bands or the mating systems of their carriers.
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