a mutagen is\n a living thing that has undergone a mutation.\n an agent that causes a mutation in dna.\n a…
a mutagen is\n a living thing that has undergone a mutation.\n an agent that causes a mutation in dna.\n a mutation that has affected one gene.\n any chemical that can poison living cells.
Answer
Brief Explanations:
A mutagen is defined as an agent (which can be chemical, physical like radiation, etc.) that induces changes (mutations) in the DNA sequence. A living thing with a mutation is a mutant. A mutation affecting one gene is just a single - gene mutation. A chemical that poisons cells is a toxin (not necessarily causing a mutation).
Answer:
an agent that causes a mutation in DNA.