Details

Autor(en) / Beteiligte

• Normark, Benjamin B

Titel

The strange case of the armored scale insect and its bacteriome

Ist Teil von

• PLoS biology, 2004-03, Vol.2 (3), p.E43-E43

Ort / Verlag

United States: Public Library of Science

Erscheinungsjahr

2004

Quelle

MEDLINE

Beschreibungen/Notizen

• Some species of monkeys (marmosets) typically have chimeric blood, from having shared a blood supply with a twin in utero (Haig 1999), and rare cases of accidental chimerism are known from many animal species (Tremblay and Caltagirone 1973; van Dijk et al. 1996). (Photographs by Raymond J. Gill, © 2003 California Department of Food and Agriculture, published here under the terms of the Creative Commons Attribution License.) Obligate chimerism--the presence of two genetically distinct cell lineages in every individual at each life stage--is found in a few families of scale insects, but nowhere else in nature. Two Different Cell Lineages In all sexual animals and plants, production of an egg cell involves meiosis, the complex cellular process (involving DNA replication, recombination, and two nuclear divisions) whereby one diploid nucleus (with two copies of each chromosome) becomes four genetically different haploid nuclei (each with one copy of each chromosome).