What defines autosomal genes?

Autosomal genes are defined as genes located on the autosomes, which are the chromosomes that are not involved in determining the sex of an individual. Humans have 22 pairs of autosomes and one pair of sex chromosomes, making a total of 46 chromosomes. The distinction of autosomal genes lies in the fact that they are present in both males and females, as they are not restricted to the sex chromosomes (which would include genes on the X and Y chromosomes).

Therefore, the correct statement emphasizes that all genes in the body, with the exception of sex-linked genes, are classified as autosomal genes. This encompasses a vast array of traits and functions in the body, since autosomal genes are responsible for a significant part of our genetic makeup. The focus on excluding sex-linked genes clarifies that the classification specifically pertains to the non-sex chromosomes, which account for the majority of genetic information.

The other options, such as genes only located on sex chromosomes, genes expressed primarily in males, or genes inherited only from one parent, do not accurately define autosomal genes, as they focus on limitations that do not apply to the broader category of autosomal inheritance.