Final Answer:
Centrioles are crucial organelles in animal cell mitosis, as they organize the microtubules to form the spindle apparatus, facilitating the proper segregation of chromosomes during cell division. Thus the correct answer is c) Centrioles.
Step-by-step explanation:
The spindle apparatus plays a crucial role in animal cell mitosis, ensuring the proper segregation of chromosomes into daughter cells. Centrioles are the organelles directly involved in the formation of the spindle apparatus. These cylindrical structures, located near the nucleus, organize the microtubules that make up the spindle fibers. The spindle fibers extend from the centrioles to the chromosomes, aiding in their movement during cell division.
During prophase, centrioles duplicate, forming a pair of centrosomes, and move to opposite poles of the cell. As mitosis progresses, the spindle fibers, composed of microtubules, emanate from the centrosomes, creating the spindle apparatus. The spindle fibers attach to the centromeres of chromosomes and help align them along the cell's equator during metaphase. Subsequently, during anaphase, the spindle fibers shorten, pulling the sister chromatids apart to opposite poles of the cell. Finally, in telophase, the spindle apparatus disassembles, and the cell undergoes cytokinesis, completing the process of cell division.
So, the correct answer is c) Centrioles.