what does the mitotic spindle do course hero

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What is a mitotic spindle?

The mitotic spindle is a structure composed of microtubules that segregate chromosomes into the daughter cells during mitosis. Learn more about it's definition, formation and function.

What is the function of the centrosome and spindle pole?

The centrosome is an organelle that serves as a microtubule organizing center during cell division. The spindle pole is the region of the cell where the centrosome is located and toward which the chromosomes will move.

What is the shape of the spindle microtubules?

Well, if you look at the shape of the kinetochore or spindle microtubules, they actually form the shape of a spindle, like the ones that are used in the textile industry to form wool or other fibers into thread. The mitotic spindle is a structure composed of microtubules which segregates chromosomes into the daughter cells during mitosis.

What does the mitotic spindle play a critical role in?

The mitotic spindle plays a critical role during the later phases of mitosis as it orchestrates the movement of sister chromatids to opposite poles of the cell (Figure 2).

What is meant by mitotic spindle?

The mitotic spindle is a structure that forms during cell division and separates duplicated chromosomes. In eukaryotic cells, the mitotic apparatus is composed of two centrosomes and spindle microtubules (Figure 43.9). The centrosome is 1–2 μm in diameter.

Which step of mitosis involves the spindle fibers?

ProphaseProphase is the first step of mitosis, during which chromosomes condense and the nuclear envelope dissolves. Metaphase follows prophase. During metaphase, the chromosomes align in the center of the cell at the equatorial plate and the spindle fibers attach to the centromeres of the chromosomes.

During which phase of mitosis do the chromatids become chromosomes?

Sister chromatids of a chromosome separate and start to travel towards opposite poles during anaphase of mitosis. Sister chromatids become individual chromosome as soon as they separate. Hence answer will be ANAPHASE .

What is the function of the mitotic spindle chegg?

Mitotic spindles are responsible for the separation of sister chromatids during mitosis.

What is the mitotic spindle and what is it made of?

The mitotic spindle is a highly dynamic molecular machine composed of tubulin, motors, and other molecules. It assembles around the chromosomes and distributes the duplicated genome to the daughter cells during mitosis.

What are the functions of mitotic cell division?

Mitosis is a process where a single cell divides into two identical daughter cells (cell division). During mitosis one cell? divides once to form two identical cells. The major purpose of mitosis is for growth and to replace worn out cells.

Which step of mitosis involves spindle fibers pulling the chromosomes to opposite ends of the cell?

Anaphase is when the spindle fibers are pulling the chormosomes to opposite ends.

What does each phase of mitosis do?

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 ...

During which stage of mitosis does the mitotic spindle break down?

telophaseIn telophase, chromosomes arrive at opposite poles and begin to decondenese. nuclear envelope material surrounds each set of chromosomes. the mitotic spindle breaks down.

What would happen if the cell did not have spindle fibers?

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.

Which of the following statements about the mitotic spindle is true?

The correct answer is (c); it is composed of microtubules, which help separate the chromosomes to opposite poles of the cell.

How to remember the mitotic spindle?

Don't leave yet. Here's one more way to remember the mitotic spindle: Condensation makes DNA ready. And microtubules hold it steady. A microtubule's a fancy rope. To move the DNA is the hope. From spindle poles they do extend. To align each chromosome in the end. To unlock this lesson you must be a Study.com Member.

What is the mitotic spindle?

Lesson Summary. The mitotic spindle is a structure composed of microtubules which segregates chromosomes into the daughter cells during mitosis. A microtubule is a rope-like component of the cytoskeleton. The centrosome is an organelle that serves as a microtubule organizing center during cell division.

What is the function of the astral microtubule?

An astral microtubule is a short microtubule which emanates from the centrosome and serves to accurately position the mitotic spindle within the cell. A kinetochore microtubule is a microtubule which attaches to the kinetochore and positions the chromosomes during mitosis. Wait, wait, wait!

What is the name of the spindle that organizes microtubules?

Now, microtubules organize into what is known as the mitotic spindle. Before we can understand how the mitotic spindle works, we need to know a little bit more about the components that make it up. Microtubules are the major component of the mitotic spindle .

What organelle is used to tether chromosomes?

First off, if we're going to use ropes to tether the chromosome, we should probably anchor at least one end of the rope to something that's not going to move, and the centrosome can serve this function. The centrosome is an organelle that serves as a microtubule organizing center during division.

What is the function of microtubules in mitosis?

During mitosis, they're used to position the chromosomes at a specific position inside of the cell. If we attach microtubules to both sides of the chromosome, we can increase or decrease the tension on each side to position the chromosomes in the middle of the cell. You must c C reate an account to continue watching.

What makes DNA ready?

Condensation makes DNA ready / And microtubules hold it steady / A microtubule's a fancy rope / To move the DNA is the hope / From spindle poles they do extend / To align each chromosome in the end

What is the Mitotic Spindle?

Mitosis is the process that occurs when somatic cells divide to produce two daughter cells that are exact clones of each other. All types of cells except for reproductive cells are considered somatic. This includes skin cells, muscle cells, and brain cells, among others.

What is the Mitotic Spindle Made of?

The mitotic spindle is made of long fibers called microtubules. Hundreds or even thousands of microtubules form the mitotic spindle. Microtubules, long polymers of tubulin, are critical components of the cell's cytoskeleton and play a key role in mitosis. Microtubules are rope-like components of the cytoskeleton.

What Forms the Mitotic Spindle

During interphase, which occurs before mitosis, a parent cell's chromosomes and DNA are replicated. During prophase, the mitotic spindle forms. The mitotic spindle is composed of hundreds or even thousands of microtubules. Microtubules are critical in the cell's cytoskeleton and play a key role in mitosis.