During prophase, the complex of DNA and proteins contained in the nucleus, known as chromatin, condenses. … The mitotic spindle is made of long proteins called microtubules that begin forming at opposite ends of the cell. The spindle will be responsible for separating the sister chromatids into two cells.
What happens to the mitotic spindle in this stage?
As mitosis progresses, the microtubules attach to the chromosomes, which have already duplicated their DNA and aligned across the center of the cell. The spindle tubules then shorten and move toward the poles of the cell. As they move, they pull the one copy of each chromosome with them to opposite poles of the cell.
What happens to the centrioles and spindle during prophase?
During prophase, the centrioles move to opposite ends of the nucleus and a mitotic spindle of threads begins to appear. Those threads then connect to the now apparent chromosomes. During anaphase, the chromosomes are split and pulled towards each centriole.
What happens to the spindle from prophase to anaphase?
During mitosis, the spindle fibers are called the mitotic spindle. Meanwhile, during meiosis, the spindle fibers are referred to as the meiotic spindle. … Next, during anaphase, the chromosomes are simultaneously separated and pulled by the spindle to opposite poles of the cell.
What happens if spindle fibers don’t form?
For herbicides with this mode of action, the prophase sequence is normal, but without the spindle apparatus, chromosomes are unable to move into the metaphase configuration and daughter chromosomes cannot migrate to their respective poles.
What is the difference between spindle and microtubules?
They are the same thing. As the others have written, microtubules are a “track” that can move organelles around when “motor” proteins (that cleave ATP) pull those organelles. The spindle is what moves the chromosomes during mitosis and meiosis.
What happens in the stages of mitosis?
1) Prophase: chromatin into chromosomes, the nuclear envelope break down, chromosomes attach to spindle fibres by their centromeres 2) Metaphase: chromosomes line up along the metaphase plate (centre of the cell) 3) Anaphase: sister chromatids are pulled to opposite poles of the cell 4) Telophase: nuclear envelope …
What are the two main stages of cell division?
In eukaryotic cells, or cells with a nucleus, the stages of the cell cycle are divided into two major phases: interphase and the mitotic (M) phase.
In which type of cell division spindle is not formed?
Cells cannot divide without spindle fibre. Because, during Anaphase Spindle fibres get attached to the Kinetochore resulting in the pull apart of the sister chromatids of the Chromosomes followed by division of cytoplasm (Cytokinesis) and which is the most important step of cell division.