autosomia

Autosomia is a term that appears in some genetic literature to describe features or inheritance related to autosomes, the chromosomes that are not involved in sex determination. In many contexts, autosomia is used to refer to autosomal inheritance—the transmission of genes located on autosomes from parents to offspring.

In humans, there are 22 pairs of autosomes and one pair of sex chromosomes, for a total of 23 chromosome pairs. Autosomal traits follow Mendelian patterns of inheritance and can be either dominant or recessive. Dominant autosomal conditions require only one copy of the pathogenic allele to influence phenotype, while recessive conditions require two copies.

Examples of autosomal dominant diseases include Huntington disease and achondroplasia. Autosomal recessive diseases include cystic fibrosis and phenylketonuria. It is important to distinguish autosomal inheritance from X-linked inheritance, in which genes on the X chromosome have unique patterns of transmission and expression, often affecting males more prominently.

Due to varying usage and the existence of more precise terminology, contemporary genetics literature typically uses the terms autosomal or autosomal inheritance rather than autosomia. Autosomia remains a historical or language-specific label in some texts, with the core concept aligned with autosomes and autosomal inheritance. See also autosome, autosomal dominant, autosomal recessive, and X-linked inheritance.