On what structure are the units of inheritance situated?

The units of inheritance, which are genes, are situated on chromosomes. Chromosomes are long, coiled-up strands of DNA (deoxyribonucleic acid) molecules that carry an organism's genetic information. Genes are specific sections of DNA that encode for particular traits or characteristics of an organism, such as eye color or height. When cells divide, the chromosomes replicate and the copies are distributed to the daughter cells, ensuring that each new cell receives a complete set of genetic information.