What is defined as the complete set of an organism's DNA?

The complete set of an organism's DNA is referred to as the genome. This term encompasses all of the genetic material present in that organism, including all genes and non-coding sequences of DNA. The genome contains the instructions necessary for the growth, development, functioning, and reproduction of that organism.

In contrast, chromatin is the complex of DNA and proteins that forms chromosomes within the nucleus of eukaryotic cells, representing an organized structure rather than the complete set itself. Chromosomes are structures made of chromatin that carry genes and are only visible during cell division. Alleles, on the other hand, are specific versions of genes found at a given locus on a chromosome and do not encompass the entire genetic material of an organism.