What type of chromosome is classified as not a sex chromosome?

Autosomes are the chromosomes that are not directly involved in determining the sex of an individual. In humans, there are a total of 22 pairs of autosomes, which are identical in males and females. They carry most of the genetic information related to an individual's traits and characteristics.

In contrast, sex chromosomes are specifically the chromosomes that determine the sex of an individual, such as the X and Y chromosomes in humans. While homologous chromosomes refer to pairs of chromosomes that have the same gene sequences but may have different alleles, this term does not specify whether the chromosomes are sex chromosomes or autosomes. A centromere is a part of a chromosome that links sister chromatids, but it is not a classification of a chromosome itself. Thus, the classification of autosomes as non-sex chromosomes is a fundamental concept in genetics.