Question

In the cells of some organisms, mitosis occurs without cytokinesis. This will result in

(A) cells with more than one nucleus.

(B) cells that are unusually small.

(C) cells lacking nuclei.

(D) cell cycles lacking an S phase

Short answer

(A) The option “cells with more than one nucleus” is true.

(B) The option “cells that are unusually small” is false.

(C) The option “cells lacking nuclei” is false.

(D) The option “cell cycles lacking an S phase” is false.

Step-by-step solution

Description of mitosis

Mitosis is one of the types of cell division that results in the formation of identical daughter cells. This process is used to replace the repaired cells and is vital for the growth of an organism.

Explanation of option (A)

Cytokinesis is the process of separation of cytoplasm that happens with the formation of the cleavage furrow. It is the final step of cell division.

In some cells, mitosis will occur without cytokinesis, resulting in the formation of cells with more than one nucleus. For example, osteoclasts are the bone cells that are multinucleated cells formed without the cytokinesis process.

Therefore, the given statement is true.

Explanation of option (B)

The absence of cytokinesis in the mitosis phenomena does not create unusually small cells. Without the cytokinesis process, the cells do not divide properly.

The formation of unusually small does not occur in the absence of the cytokinesis mechanism.

Therefore, the given statement is false.

Explanation of option (C)

The cells without a nucleus are formed due to the coiling of chromosomal structures. The examples of cells that do not have a nucleus are erythrocytes.

The lack of cytokinesis is not linked with the absence of a nucleus.

Therefore, the given statement is false.

Explanation of option (D)

The synthesis phase is the crucial phase in which whole genetic material is copied to produce another set of genetic material. Cell lacking S phase does not have replicated DNA to give to two daughter cells.

The absence of cytokinesis will not cause any effects on the S phase or DNA synthesis.

Therefore, the given statement is false.