Question

Amitosis is shown by
A) Bacteria
B) Euglena
C) Virus
D) Both A and B

Answer 1

Hint: Amitosis is known as direct fission or also called binary fission. This type of division is found in bacteria and eukaryotic single-celled organisms called euglena.

Complete answer:The cell division can be two types like direct cell division and indirect cell division. The indirect cell division includes mitosis with proper chromosome division is seen. The direct cell division includes direct cell division where the nucleus divides without prior formation of chromosomes.
Mitosis has a precise division of alleles and meiosis has a random distribution of parental alleles. This shows that amitosis cannot always give the same chromosome characteristics as the parents.
There are certain characteristics which are not seen in mitosis but seen in amitosis like:
Daughter cells do not have the same number of chromosomes. The chromosomes are not equally divided in the process
Daughter cells do not undergo proper metabolism as they are randomly distributed.
Spindle fibers are not seen during the process of amitosis as there is no proper cell division cycle.
The nuclear membrane is not disappearing under a microscope instead they are seen dividing randomly.
This type of underdeveloped cell division with no regulation of cell division and no proper division of chromosome can be mainly due to the absence of many mitotic factors like spindle fiber formation.
The correct option is D.

Note:Amitosis and binary fission are the same as the steps during cell division. They both are types of direct cell division. Binary fission is very common while amitosis is very uncommon. Binary fission shows DNA replication before division and parental identity is preserved.