PMID: 7371455Jan 1, 1980Paper

Heterochromatinization, chromatin elimination and haploidization in the parahaploid mite Metaseiulus occidentalis (Nesbitt) (Acarina: Phytoseiidae)

Chromosoma
W A Nelson-ReesR T Roush

Abstract

Embryogenic mitoses, mitoses in females and spermatogenesis are described in the predatory mite Metaseiulus occidentalis (Nesbitt). At 22 degrees C, egg development lasts approximately 4 days. Six chromosomes are seen in mitotic metaphases and anaphases of 0--24 h eggs. Toward the end of this period some embryo squashes have patches of cells containing nuclei which are partially heteropycnotic. These patches of cells apparently increase in size with the age of the embryo. In approximately 1/2 of all 24--48 h-old eggs they encompass all or most cells of the embryo. In these embryos metaphases involved 6 chromosomes, anaphases 3. Either prior to, or following metaphase, a pairing of chromosomes appeared to take place to form 3 units which resembled meiotic diplotene chromosomes where there is opening out between homologues. At metaphase, two sets of 3 chromosomes were slightly differentially stained. One, designated the H set, was darker and slightly more contracted than the other, the E set. At anaphase, 3H and 3E chromosomes segregated in a reductional division retaining the differential contraction until telophase. No cytokinesis appeared. The H set appeared to remain contracted while the E set decontracted to assume the appea...Continue Reading

References

Jan 1, 1977·Annual Review of Entomology·J H Oliver
Aug 1, 1970·Theoretical Population Biology·D L Hartl, S W Brown
Jul 1, 1965·Annals of the Entomological Society of America·J H Oliver
Apr 1, 1966·Journal of Medical Entomology·J H Oliver
Feb 1, 1937·Proceedings of the National Academy of Sciences of the United States of America·K W Cooper

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Citations

Nov 7, 2008·Experimental & Applied Acarology·Shingo ToyoshimaGerd Alberti
Jan 13, 2009·Experimental & Applied Acarology·Ayyamperumal Jeyaprakash, Marjorie A Hoy
Aug 15, 1992·Proceedings of the National Academy of Sciences of the United States of America·J K Presnail, M A Hoy
Oct 1, 1995·Genome Génome / Conseil National De Recherches Canada·M J Perrot-Minnot, M Navajas
Apr 1, 2009·BioEssays : News and Reviews in Molecular, Cellular and Developmental Biology·Marjorie A Hoy
Oct 21, 2014·Ecology Letters·Andy Gardner, Laura Ross
Jun 3, 2014·Current Opinion in Genetics & Development·Jianbin Wang, Richard E Davis
Aug 25, 2009·Journal of Insect Physiology·Ana R CabreraR Michael Roe
Dec 17, 2019·PLoS Genetics·Piero LamelzaMichael Ailion
Dec 1, 1999·Evolution; International Journal of Organic Evolution·Robert H Cruickshank, Richard H Thomas
Sep 1, 1981·Evolution; International Journal of Organic Evolution·David Sloan Wilson, Robert K Colwell
Mar 16, 2017·Genetics·Christina N HodsonSteve J Perlman
May 9, 2021·Genome Biology and Evolution·Alexander Suh, Anne-Marie Dion-Côté
Jun 23, 2021·Evolution; International Journal of Organic Evolution·Miguel A CruzFlore Zélé

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