Question

How many types of fibers are there in the nuclear spindle?

• A. One
• B. Two
• C. Three
• D. Four

Answer 1

Answer: (D)

Four

There are four types of fibers in the nuclear spindle. The nuclear spindle is the fusiform figure which is a characteristic of a dividing cell, it consists of microtubules called spindle fibers, some of which become attached to each chromosome at its centromere and appear to be involved in chromosomal movement; other microtubules - continuous fibers pass from pole to pole. There are four types of fibers in the nuclear spindle-

(a) chromosomal fibres which runs from kinetochore to the pole of spindle,

(b) continuous fibres exists from pole to pole without attachment to chromosomes,

(c) interzonal fibres are formed in between centromeres of chromosomes of two poles and,

(d) Astral rays.

So, the correct answer is option D.