Equational Division

The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Equational Division

 

a method of reproduction in animal and plant cells; a rarely used synonym for mitosis. As a result of equational division the initial number of chromosomes in the cell is preserved. Equational division is contrasted with reduction division, or meiosis, as a result of which the number of chromosomes in the cell is halved.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
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Meiosis I Meiosis II Mitosis Reductional division Yes No No Equational division No Yes Yes Daughter Cells No No Yes Genetically Identical Double strand breaks Yes No No introduced by SPO11 Pol required for meiotic Yes No No recombination and chromosome synapsis Homologous chromosome Yes No No recombination and segregation Degradation of cohesion Yes Not present Not present along chromosome arms Degradation of cohesion No Yes--during Yes--during at centromeres anaphase II anaphase SGO2 protection of REC8 Yes No No located at pericentromeric regions Table 3: The Potential ramifications of the aberrant expression of different meiotic proteins.
rubromarginata the chromosome segregation takes place in anaphase I whereas the equational division occurs during anaphase II.
pedo, which is tetraploid and ameiotic, their eggs undergoing one maturation equational division (Matthey 1941, Dutrillaux et al.
When all univalents move to one pole, they, in essence, bypass the reductional division of meiosis and then, on equational division, produce unreduced gametes.
In this case, the equational division of the dyads from both groups would yield 30 chromosomes at the periphery of the egg and 30 in the interior.