Correct Answer: chromosomes

Solution : The correct option is - chromosomes.

Genes, the hereditary units that carry the instructions for building and maintaining an organism, are located in the DNA (deoxyribonucleic acid) of an organism's cells. DNA is a long, double-stranded molecule that contains the genetic information necessary for the development, functioning, and reproduction of living organisms. In eukaryotic organisms DNA is found within the cell nucleus, which is a membrane-bound compartment within the cell. The DNA in the nucleus is organized into structures called chromosomes. Each chromosome contains many genes, and the specific sequence of DNA within each gene determines the genetic code for producing proteins and other molecules necessary for life processes.