synapsis

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synapsis:

see crossing overcrossing over,
process in genetics by which the two chromosomes of a homologous pair exchange equal segments with each other. Crossing over occurs in the first division of meiosis. At that stage each chromosome has replicated into two strands called sister chromatids.
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Synapsis

 

the paired temporary association of homologous chromosomes during which an exchange of homologous chromosomal areas may occur. Under the influence of various factors, chromosomes readily contract into a ball during synapsis. The British scientist D. E. Moore described this phenomenon and introduced the term “synapsis” in 1895.

synapsis

[sə′nap·səs]
(cell and molecular biology)
Pairing of homologous chromosomes during the zygotene stage of meiosis.