What does diakinesis mean?
Diakinesis is the last of five substages of prophase I in meiosis, the specialized cell division that produces eggs and sperm. By this stage, homologous chromosomes have already paired up and exchanged genetic material through crossing over; during diakinesis they reach their most condensed state, the chiasmata — the visible points where they remain connected after recombination — slide toward the chromosome tips in a process called terminalization, and the nucleolus and nuclear envelope disassemble. The cell is then poised for the spindle to capture the chromosomes and move them into metaphase I. The term comes from Greek roots meaning 'moving apart', anticipating the segregation that follows. Diakinesis matters because errors here, such as failure of homologues to pair or segregate properly, can produce aneuploid gametes, contributing to infertility, miscarriage, or chromosomal conditions. The word belongs to formal scientific register and is chiefly encountered in genetics courses and research literature.
nounThe final stage of prophase I in meiosis, during which homologous chromosomes fully condense, the nuclear envelope breaks down, and the chiasmata formed by crossing over become clearly visible as the chromosomes prepare to move to the metaphase plate.
- The final substage of prophase I in meiosis, marked by maximal chromosome condensation, terminalization of chiasmata, and breakdown of the nucleolus and nuclear envelope.
"In diakinesis, the bivalents appear as tightly coiled structures held together only at their chiasmata."
"Cytologists can identify diakinesis under the microscope by the characteristic cross-shaped configurations of the bivalents."
"Failure of proper pairing during diakinesis can lead to unbalanced gametes and infertility."
Rarely used; biologists usually discuss the stage in the singular even when describing many cells.
"Slides from different specimens showed diakineses at varying degrees of chiasma terminalization."
The word literally means 'moving apart' in Greek — which is exactly what your chromosomes do when diakinesis ends and they head for opposite poles.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of diakinesis
Diakinesis derives from the Greek 'dia-' meaning 'apart' or 'through' plus 'kinesis' meaning 'movement'. The term was coined in the late nineteenth century alongside the modern description of meiosis, when cytologists first resolved its substages under improved microscopes. It shares the root 'kinesis' with words such as kinetic, cinema, and telekinesis, all ultimately tracing back to the Greek verb 'kinein', meaning to move.
Related word forms
How diakinesis is actually used
Strictly technical, used almost exclusively in genetics, cytology, and biology education. It appears mainly in textbooks, research papers, and exam contexts rather than general conversation.
Easily confused with diakinesis
Telekinesis is the supposed ability to move objects with the mind, whereas diakinesis is a stage of cell division in meiosis; they share Greek roots but nothing else.
Cytokinesis is the division of a cell's cytoplasm at the end of cell division, while diakinesis occurs much earlier as the closing phase of prophase I.