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  • Title: Relative orientation with respect to the centromere of ribosomal RNA genes of the X and Y chromosomes of Drosophila melanogaster.
    Author: Palumbo G, Caizzi R, Ritossa F.
    Journal: Proc Natl Acad Sci U S A; 1973 Jun; 70(6):1883-5. PubMed ID: 4198277.
    Abstract:
    We tested for recombination within the DNA that codes for ribosomal RNA (rDNA) on the X and Y chromosomes of Drosophila melanogaster. The criterion was the appearance of intermediate bb alleles on X-Y recombinants from wild bb(+) and lethal bb(1) loci carried on parental chromosomes. Recombination within the rDNA occurs only when the rDNA of the X chromosome is inverted. We conclude that rDNAs of normal X and Y chromosomes have opposite orientation with respect to the centromere. The implications of this observation are discussed.
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