Question:

Spindle fibres attach on to

Updated On: Apr 20, 2025

Kinetochore of the chromosomes
Centromere of the chromosomes
Kinetosome of the chromosomes
Telomere of the chromosomes

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The Correct Option is A

Solution and Explanation

The correct answer is Option 1: Kinetochore of the chromosomes.

Explanation:

Spindle fibers are structures that are crucial during cell division (mitosis and meiosis). They are responsible for pulling the chromosomes apart to opposite poles of the cell.

These fibers attach to the kinetochore, a specialized region located at the centromere of the chromosome. The kinetochore is where the spindle fibers bind and pull the chromosomes during cell division.

Breakdown of Options:

Option 1: Kinetochore of the chromosomes: Correct. Spindle fibers attach to the kinetochore, a protein complex found at the centromere of the chromosomes.

Option 2: Centromere of the chromosomes: Incorrect. The centromere is the region where the sister chromatids are joined, but the spindle fibers attach to the kinetochore at the centromere.

Option 3: Kinetosome of the chromosomes: Incorrect. The kinetosome (or basal body) is associated with the formation of cilia or flagella, not the attachment of spindle fibers during cell division.

Option 4: Telomere of the chromosomes: Incorrect. Telomeres are the protective caps at the ends of chromosomes, not the attachment sites for spindle fibers.

Conclusion:

The correct answer is Option 1: Kinetochore of the chromosomes. Spindle fibers attach to the kinetochore during cell division to ensure proper chromosome separation.

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Concepts Used:

Meiosis

Meiosis is a process in which a single cell, a diploid cell, undergoes division twice to produce four haploid daughter cells, and the cells produced are known as the sex cells or gametes (sperms in males and egg in females). It contains half of the original amount of genetic information. The haploids only have half the number of chromosomes of the parent cell.

Features of Meiosis:

It results in the formation of four daughter cells in each cycle of cell division.
The daughter cells are identical to the mother cell in shape and size but different in chromosome number.
The daughter cells are haploid.
Recombination and segregation take place in meiosis.
The process occurs in the reproductive organs and results in the formation of gametes.
The process is divided into two types-Meiosis-I reduces the chromosome number to half and is known as reductional division. Meiosis-II is just like the mitotic division.

Phases of Meiosis

Meiosis can be divided into nine stages. The process is usually divided into two parts. The first time a cell divides (meiosis I) and the second time it divides (meiosis II). The phases are as follows –

Meiosis 1 Stages

The different stages of meiosis 1 can be explained by the following phases :

Prophase 1
Metaphase 1
Anaphase 1
Telophase 1

Meiosis 2 Stages