Question

In the given figure, there are stages of binary fission in Amoeba. Which one out of the following would you select as the correct sequence of these stages?

A) A, B, C, D
B) A, C, D, B
C) B, D, A, C
D) C, A, D, B

Answer 1

Hint: Binary fission, a form of asexual mode of reproduction, is typically found in prokaryotes and a few single-celled eukaryotes. It involves the division of the parent cell into two new daughter cells. In this process, the genetic material of the parent cell divides and duplicates into two parts. Hence, each daughter cell gets one copy of its parent DNA.

Complete answer:
Binary Fission in Amoeba
Being a unicellular organism, Amoeba also reproduces through binary fission. Now let us look at each of the stages shown in the image to find out the correct sequence of binary fission in Amoeba.
Stage (A): It shows the process of Cytokinesis. In this process, the cell’s cytoplasm divides into two daughter Amoebae cells having a nucleus and its own cell organelles.
Stage (B): It shows the parent Amoeba which duplicates its genetic material through mitotic division.
Stage (C): It shows the 2 new daughter cells formed after the process of cytokinesis.
Stage (D): It shows the process of Karyokinesis. In this process, the nucleus of the Amoeba divides to form 2 daughter nuclei. An Amoeba that is about to undergo division grows to become large, and finally, its nucleus extends and divides into two. The process is followed by cytokinesis. Thus, the correct order of sequence will be B, D, A, C

Thus the correct answer is option ‘C’.

Note: The advantage of binary fission is that it is a simple and fast process that only requires a single organism. But it is considered disadvantageous because the DNA that is passed on by the parent cell is unaltered, meaning there is no genetic variation.