Analysis of Chromatin in Male and Female Mealy Bugs

THE chromosome system of the mealy bug, Planococcus citri (= Pseudococcus ), is unique for the study of differences between heterochromatin and euchromatin. In the male, the paternal chromosomes are heterochromatic; that is, they remain condensed throughout interphase. In the female, both maternal a...

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Veröffentlicht in:Nature (London) 1968-05, Vol.218 (5140), p.474-476
1. Verfasser: LOEWUS, MARY W
Format: Artikel
Sprache:eng
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Zusammenfassung:THE chromosome system of the mealy bug, Planococcus citri (= Pseudococcus ), is unique for the study of differences between heterochromatin and euchromatin. In the male, the paternal chromosomes are heterochromatic; that is, they remain condensed throughout interphase. In the female, both maternal and paternal sets are euchromatic. The paternal set behaves like heterochromatic sex chromosomes of other organisms; it reproduces asynchronously from the maternal or euchromatic set and is genetically inert 1 . Marker genes in the mealy bug are expressed in the male only if received from the mother (personal communication from S. W. Brown). X-ray damage to the heterochromatic set is not expressed 2 and the heterochromatic set is not labelled with tritiated uridine 3 .
ISSN:0028-0836
1476-4687
DOI:10.1038/218474a0