microtubles made from the lateral association of alpha and beta tubulin dimers
It is a small change, yet it may be so that spindle fibers actually extend to the centromeres during Mitosis.
These are called nonkinetochore spindle fibers.
Polar Fibers
polar fibes
During Mitosis, during metaphase, the centrioles grow spindle fibers which attach to the chromosomes located currently on the centrosome. They then pull one half of the chromosome to their side of the cell, this process is called anaphase. They then disappear.
the spindle fibers
The centrosome. The mitotic spindle. The spindle apparatus.
Spindle Fibers
Centrioles
true
Microtubules and kinetochore fibers move the chromosomes in mitosis and meiosis, though they are not referred to as organelles. Though you could say that the fibers originate from the centrioles, which are a part of the centrosome.
Spindle fibers are necessary in mitosis as they help in bringing half the number of chromosomes on each side of the cell, so that when the cell divides, the chromosomes are distributed equally in both the daughter nuclei.
During Mitosis, during metaphase, the centrioles grow spindle fibers which attach to the chromosomes located currently on the centrosome. They then pull one half of the chromosome to their side of the cell, this process is called anaphase. They then disappear.
Centrioles. They are visible during metaphase, the second stage of mitosis. Added: Centrosomes. Centrioles are present in animal cells but are, seemingly, not needed to mount a spindle apparatus. Plant cells get along very well without centrioles.
Spindle fibers.
Kinetochore fibers are thought to move chromosomes.
spindle
the spindle fibers
During mitosis a double-stranded chromosome attaches to a spindle fiber centromere.
The centrosome. The mitotic spindle. The spindle apparatus.
Spindle Fibers