A mutagen is
a living thing that has undergone a mutation.
an agent that causes a mutation in DNA.
a mutation that has affected one gene.
any chemical that can poison living cells.

Mutagen is the chemical or biological agent that results in mutation in the genetic or the hereditary material of the living organism. Thus, option B is correct.

What are mutagens?

Mutagens are substances that can be chemical or biological and causes alterations and modifications in the genetic material of the organisms. They can cause positive and negative damages in the process of the replication and repair mechanism.

UV rays, X rays, ROS, base analogs, alkylating agents, transposons, viruses, etc., are some examples of mutagens that can cause somatic or germline mutations. They can cause silent, missense, nonsense, deletion, addition, or substitution mutations.

Therefore, mutagens cause a mutation by altering the genetic material.

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A mutagen is a living thing that has undergone a mutation. an agent that causes a mutation in DNA. a mutation that has affected one gene. any chemical that can poison living cells.

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What are mutagens?

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A mutagen is
a living thing that has undergone a mutation.
an agent that causes a mutation in DNA.
a mutation that has affected one gene.
any chemical that can poison living cells.