WHAT CAUSE CHROMOSAL MUTATIONS?

Mutations arise spontaneously at low frequency owing to the chemical instability of purine and pyrimidine bases and to errors during DNA replication. Natural exposure of an organism to certain environmental factors, such as ultraviolet light and chemical carcinogens (e.g., aflatoxin B1), also can cause mutations.

Wat r u trying to

So that you don't get baby's but also prevents stis such as hiv