What organelle produces spindle fibers during mitosis?

centrioles

The organelle responsible for producing spindle fibers during mitosis is known as the centrosome or microtubule-organizing center (MTOC). To understand how to arrive at this answer, let's break down the question and analyze the topic.

Mitosis is a process of cell division in eukaryotic cells that results in the production of two identical daughter cells. During mitosis, several distinct stages occur, including prophase, metaphase, anaphase, and telophase. One significant aspect of mitosis is the formation and function of spindle fibers.

Spindle fibers are specialized microtubules that play a vital role in separating chromosomes correctly during cell division. They attach to the chromosomes at a region called the kinetochore and help move the chromosomes to opposite poles of the cell. The formation of spindle fibers begins during the prophase stage of mitosis.

Now, let's focus on the specific organelle responsible for producing these spindle fibers. The centrosome, or MTOC, is a small organelle found near the nucleus of the cell. It consists of two centrioles surrounded by pericentriolar material. The centrosome plays a crucial role in organizing and assembling microtubules, including spindle fibers, which are crucial for the proper segregation of chromosomes during mitosis.

To summarize, the organelle responsible for producing spindle fibers during mitosis is the centrosome or microtubule-organizing center (MTOC). By understanding the stages and key players involved in mitosis, we can determine the correct answer to the question.