Question

Nuclear spindle has _______ types of fibres
a. One
b. Two
c. Three
d. Four

Answer 1

According to cell biology, the term nuclear spindle (which is also called spindle apparatus) refers to the cytoskeletal structure, which presents in the eukaryotic cells that form in the duration of cell division to separate the sister chromatids amid the daughter cells. It is not only the chromosomes present in the nuclear spindle. The abundant components of the machinery are present in the microtubules.

Complete answer:
We know that the nuclear spindle is also called a mitotic spindle. It is said that the spindle apparatus is composed of hundreds of proteins in addition to the chromosomes. It has different definitions in It is said that there are three types of spindle fibers.

They are named as the following:

Continuous spindle fiber: The continuous spindle fibers are the type of spindle fibers that are generally continuous from one pole to the other cell's other pole.
Discontinuous spindle fiber: The Discontinuous spindle fibers are the type of spindle fibers that typically run between the pole and centromeres of the cell.
Interzonal spindle fiber: The Interzonal spindle fibers are the type of spindle fibers that typically runs between 2 centromeres of the section.

The astral rays are considered to be the fourth type of 'Nuclear spindle. However, we can say that these are interzonal fares looked upon as artifacts by many workers.

Hence, the correct answer is option (C).

Note: Different processes. In the duration of mitosis, it is defined as the procedure that produces genetically identical daughter cells. However, on the other hand, in the period of the process of meiosis, it is determined to be a procedure that produces the gametes with half the number of chromosomes that present in the parent cell.