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Which of the following modes of asexual reproduction is used by unicellular organisms exclusively?
Regeneration
Binary fission
Fragmentation
Sporulation
Binary fission
Binary fission is an asexual reproduction method used exclusively by unicellular organisms like bacteria, Amoeba, and Paramecium. In this process, the parent cell replicates its genetic material and divides into two identical daughter cells of approximately equal size.
Binary fission is an asexual reproduction method used exclusively by unicellular organisms like bacteria, Amoeba, and Paramecium. In this process, the parent cell replicates its genetic material and divides into two identical daughter cells of approximately equal size.
Think of binary fission like taking a single sticky note with a list of tasks and photocopying it perfectly to create two identical lists, then cutting the paper in half so two people have the exact same starting instructions.
B-2: Binary means 'two', and Fission means 'splitting'тАФsplitting into two.
NtтАЛ=N0тАЛ├Ч2n тАФ where NtтАЛ is the final population, N0тАЛ is the initial, and n is the number of divisions.
The process begins with DNA replication where the organism's circular chromosome is copied. Subsequently, the cell undergoes cytokinesis, where the cell membrane pinches inward at the center, dividing the cytoplasm into two parts. This results in two independent unicellular organisms, each containing a complete set of genetic information.
It is a form of asexual reproduction.
The process leads to the creation of clones.
It is the primary mode of reproduction for prokaryotes (Bacteria/Archaea) and many protozoans.
No gametes are involved in this process.
Rapid multiplication of population.
Does not require a mate.
Energy efficient.
Lack of genetic diversity.
High vulnerability to sudden environmental changes.
Bacterial colonization
Protozoan population growth
Regeneration (A) is a regenerative process, not an exclusive mode of reproduction for all unicellular organisms.
Fragmentation (C) typically occurs in multicellular organisms like Spirogyra.
Sporulation (D) occurs in fungi and some bacteria as a survival strategy, not exclusively for reproduction.
B is correct тАФ Binary fission is a type of asexual reproduction where a single parent cell divides into two equal-sized daughter cells, occurring exclusively in unicellular organisms.
Always remember that in binary fission, the parent cell identity is lost as it becomes two new daughter cells, unlike budding where the parent cell remains distinct.
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