DNA and Genetic IssuesWatch
To keep some detail [as mentioned by QuentinM] simple and succinct, you will know that the code in DNA is transcribed onto mRNA then translated into specific proteins.
External factors such as drugs or physical or radiation damage can alter the genetic code [a mutation].
Drugs more often result in a promotion or suppression of genes i. e. some drugs work by stimulating or inhibiting gene expression so that a protein may be produced in excess or not synthesized e.g. the glucocorticoids (steroids) act on glucocorticoid receptors (GR: protein in nature) that then enter the nucleus and can stimulate or inhibit the synthesis of specific proteins by increasing or decreasing gene expression, respectively.
So yes, it does occur!
M (A level biology tutor)
Yes, the "environment" an organism is exposed to can influence genetics. In a coding sense, it can cause mutations by damaging DNA. In a non-coding sense, the field of epigenetics is the study of this. And its a pretty massive field so I won't go into it here unless you want me to
So, such the radioactive could influence my chromosom? Or, my nucleutide?
Even I don't find any genetic disease in my family trees, but I can create it in my chromosom?