Abstract
Recombination in the proximal X chromosome interval (forked-centromere) has been studied in hybrids from two inbred lines of Drosophila melanogaster. Attached Ysy+ arms or the proximal region of the Dp (1:1) scV1y+ were used as markers of the centromere. A derived Y chromosome (BsYK) induced a reduction of the recombination frequency in only one of five comparative experiments of XXBsYK and XX females. In two of the tests there was a higher frequency of recombination in the presence of the BsYK. This is not consistent with a competitive preexchange XX and XY association, which according to a generally accepted idea should result in an inevitable decrease in recombination. This is considered as further evidence for non-random Y distribution at regular X disjunction being determined after exchange.
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