Idiochromosomes, also known as "autosomes," are chromosomes that are not involved in sex determination like the X and Y chromosomes. They carry genes that determine various characteristics of an individual, such as eye color, hair color, and height. Other synonyms for idiochromosomes include non-sex chromosomes, ordinary chromosomes, non-allosomes, and somatic chromosomes. These chromosomes occur in pairs, with one chromosome inherited from each parent. The majority of an individual's genes are located on idiochromosomes, making them essential for normal development and growth. Differences in the number or structure of idiochromosomes can lead to genetic disorders and developmental abnormalities. Studying idiochromosomes is crucial for understanding human genetics and genetic disorders.