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In meiosis, absence of a chiasma generally results in improper chromosomal segregation and aneuploidy.

Points of crossing over become visible as chiasma after the synaptonemal complex dissembles and the homologous chromosomes slightly apart from each other.

The phenomenon of genetic chiasmata (chiasmatypie) was discovered and described in 1909 by Frans Alfons Janssens,

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