- THIS ARTICLE
- Full Text (PDF)
- Alert me when this article is cited
- Alert me if a correction is posted
- SERVICES
- Similar articles in this journal
- Similar articles in PubMed
- Alert me to new issues of the journal
- Download to citation manager
- Reprints & Permissions
- CITING ARTICLES
- Citing Articles via HighWire
- Citing Articles via Google Scholar
- GOOGLE SCHOLAR
- Articles by Roberts, P. A.
- Search for Related Content
- PUBMED
- PubMed Citation
- Articles by Roberts, P. A.
RAPID CHANGE OF CHROMOMERIC AND PAIRING PATTERNS OF POLYTENE CHROMOSOME TIPS IN D. MELANOGASTER: MIGRATION OF POLYTENE-NONPOLYTENE TRANSITION ZONE?
Paul A. Roberts 1
1 Department of Zoology, Oregon State University, Corvallis, Oregon 97331
The high variability of chromomeric patterns in near-terminal regions of polytene chromosome arms has been explored in a number of races, strains and hybrids of Drosophila melanogaster. Traditional explanations for tip differences between strains (differential compaction of chromatin, somatic or germinal deletion) are examined and, in the light of the reported observations, rejected. The range of polytene tip variability and rates of change in wild races are greater than has been supposed: strains formerly considered to be terminally deleted appear to gain terminal bands; others, formerly considered normal, appear to have lost them. Strains with high cell-to-cell tip variability are also described. Cell-to-cell variations, as well as much of the observed rapid changes in tip appearance, are probably due to heritable differences in the location of an abrupt transition zone between polytene and nonpolytene chromatin. A quantitative relationship between the amount of certain subterminal bands present and the frequency of tip association of nonhomologous chromosomes is shown and its possible significance for chromosome pairing discussed.
Submitted on October 9, 1978Revised on January 31, 1979
This article has been cited by other articles:
 |
|
 |
|
  J. A. Anderson, Y. S. Song, and C. H. Langley Molecular Population Genetics of Drosophila Subtelomeric DNA Genetics, January 1, 2008; 178(1): 477 - 487. [Abstract] [Full Text] [PDF]
|
|