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 |
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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
. |
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ISSN: | 0028-0836 1476-4687 |
DOI: | 10.1038/218474a0 |