An article about half-lives describes a parent isotope. what is a parent isotope?

A parent isotope plays an important role in the decay chain process. The parent isotope is the one who undergoes the decay process in the nuclear reaction in order to form its daughter isotope. The daughter isotope may decay on its own and may have its own daughter isotope as well.

ye, whats dna? dna stands for deoxyribonucei acid. dna holds genetic information that determines an organisms traits. dna also contains the instructions for making proteins