Traits are determined by genes, and also they are determined by the interaction with the environment with genes. And remember that genes are the messages in our DNA that define individual characteristics. So the trait is the manifestation of the product of a gene that is coded for by the DNA.

Where do all traits come from?

Each Organism's Traits Are Inherited from a Parent through Transmission of DNA. Drosophila chromosome. Scientists first discovered chromosomes in the nineteenth century, when they were gazing at cells through light microscopes.

Where do our traits or behavior came from?

Information from genes let the body know what characteristics a person will have, like if they will have hairy or hairless ears and/or a small or big chin. These instructions come from our parents; when their genes are mixed together, our set of genes is formed. This is why we often look like a mixture of our parents!