parasynapsisn.
/ˌparəsᵻˈnapsɪs/, U.S. /ˌpɛrəsəˈnæpsəs/ Cell Biology. Now rare or disused.
Side-by-side pairing of chromosomes at meiosis. Cf. telosynapsis n. at telo- comb. form1 .
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the world > life > biology > biological processes > genetic activity > [noun] > other processes in mitosis or meiosis
zonation1899
diakinesis1902
parasynapsis1909
syndesis1909
parasyndesis1911
non-disjunction1913
non-conjunction1925
asynapsis1930
stathmokinesis1938
misdivision1939
metakinesis1948
tandem duplication1959
1909 E. B. Wilson in Jrnl. Exper. Zool. 6 84 Pyrrochoris shows a close similarity to Tomopteris... This comparison has convinced me that synapsis occurs at the same period in both—whether by parasynapsis (side to side union) or telosynapsis (end to end union). [Note] I have for some years made use of these terms in my lectures on cytology.
1912 Jrnl. Exper. Zool. 13 392 Do they [sc. the chromatin-elements] conjugate side by side (parasynapsis, parasyndesis), end to end (telosynapsis, metasyndesis) or in both ways?
1925 E. B. Wilson Cell (ed. 3) vi. 508 Evidence has steadily accumulated to show that in a large class of cases synapsis involves a side-by-side union of the synaptic mates (parasynapsis or parasyndesis) instead of an end-to-end union..as was formerly supposed.
1932 Proc. 6th Internat. Congr. Genetics II. 319 Parasynapsis may be demonstrated..by observation of actual side-by-side association of homologous chromosomes or chromosome-segments at zygotene.
1954 Amer. Midland Naturalist 51 178 Pseudoreduction by parasynapsis takes place in the primary spermatocytes while the chromatin material is in the prophase.
This entry has been updated (OED Third Edition, June 2005; most recently modified version published online March 2022).
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n.1909