pachytene
/ˈpækɪtiːn/noun
mass noun
- Biology the third stage of the prophase of meiosis, following zygotene, during which the paired chromosomes shorten and thicken, the two chromatids of each separate, and exchange of segments between chromatids may occur【生】粗线期。
词源
early 20th cent.: from Greek pakhus 'thick' + tainia 'band'.