Which statement is true regarding genes?

Genes play a crucial role in determining the traits and characteristics of an organism. They are segments of DNA that contain the instructions for building and maintaining the cells of living organisms. When genes are expressed, they lead to the production of proteins, which perform a vast array of functions in the body. This process is fundamental in controlling various physical traits, such as hair color, height, and susceptibility to certain diseases.

The statement that genes control the development of certain characteristics accurately reflects the function of genes within biological systems. Genes are the blueprint for traits, and variations in these genes can lead to different traits being expressed, which is a cornerstone of genetics. Understanding this connection helps explain inheritance patterns, the variability observed in populations, and the principles of evolutionary biology.

The other statements do not accurately represent the role and significance of genes in genetics. For instance, genes are certainly relevant to chromosome function, they significantly influence characteristics, and they are primarily found in DNA, not exclusively in RNA. This underscores the importance of genes in heredity and biological functions.