Literally meaning: “thick band”
Origin: Anc Greek
παχύς/pachys(=fat, dense) >πακτόω/pactoo(=block, shut)
ταινία/taenia(=band, ribon)> τανύω/tanyo(=strain)
In 1912 by The Belgian cytologist and gynecologist Hans von Winiwarter (1875-1949) who had an interest in the nature of gender determination, reported from his studies of fetal ovaries that the human diploid chromosome number was probably 48.
Pachytene is one of the stages of prophase I in which the homologous chromosomes become short and thick and divide into four distinct chromatids.