what moves chromatids during mitosis
The chromatids are moved during mitosis by the mitotic spindle , a structure made of microtubules plus attached motor proteins that pull them toward opposite poles of the cell.
Quick Scoop: What actually “moves” chromatids?
You can imagine mitosis like a highly choreographed tug-of-war where specialized protein “ropes” and “motors” do the work.
The key players that move chromatids are:
- Spindle fibers (microtubules) : Long protein fibers that attach to chromosomes and physically pull them.
- Kinetochores : Protein complexes on the centromere where spindle fibers attach; they act as coupling devices.
- Motor proteins (like dynein and kinesin) : Tiny ATP-powered “motors” on kinetochores and microtubules that generate the pulling forces.
- Mitotic spindle as a whole : The entire microtubule-based machine that organizes and drives chromosome movement.
In many basic worksheets or exams, the expected short answer to “what moves the chromatids during mitosis?” is:
Spindle fibers (the mitotic spindle).
How they move during anaphase
During anaphase , sister chromatids separate and head to opposite poles.
- Cohesin holding sister chromatids together is broken, so each chromatid becomes its own chromosome.
- Kinetochore microtubules shorten (called anaphase A), drawing chromatids toward the poles.
- Spindle poles move farther apart (anaphase B) as other microtubules slide and astral microtubules pull on the cell cortex, further separating the chromatids.
Researchers describe two overlapping mechanisms for this motion:
- Motor proteins at kinetochores walking along microtubules, using ATP.
- Energy released as microtubules depolymerize (shorten) at their ends, helping “reel in” the chromosomes.
Mini FAQ and forum-style angle
“So if I’m filling in a blank on a worksheet, what should I write?”
Most school-level keys want: “spindle fibers” or “mitotic spindle.”
“Is it just one thing doing the job?”
Not really. The spindle, kinetochores, and motor proteins work together like a machine, but the simple name for the structure that moves chromatids is still the mitotic spindle.
“Why is this such a common question online?”
It shows up constantly in cell cycle study guides, digital worksheets, and homework help forums, so it’s become a classic checklist question.
TL;DR: The chromatids are moved during mitosis by spindle fibers of the mitotic spindle , with help from kinetochores and motor proteins that pull them to opposite poles.
Information gathered from public forums or data available on the internet and portrayed here.