During meiosis, formation of pairs with their homologes is one
of the most important unique properties of chromosomes.
This process begins without any homologs association but later
forms a synaptonemal complex - synapsis, which
appears as a polymer, holding each homologs pair along their entire
length together.
Homologous chromosomes pairing is known as
synapsis and may involve cross over between non-sister
chromatids at chiasmata.
Homologs alignment depends upon many factors such as ;
Interaction of many sites on chromosomes together,
Genetic recombination, and
Telomeres association with the envelope of nucleus
Meiotic pairing ensures the proper chromosomes
distribution in daughter cells.
This pairing often results in crossover between
chromosomes.
A triploid will be the expected meiotic pairing
configuration in a trivalent.