Autosomal Recessive Trait

Autosomal recessive trait refers to a specific characteristic or disorder that is determined by a gene located on one of the autosomes (non-sex chromosomes) found in the nucleus of the cell. Inheritance of autosomal recessive traits follows a specific pattern, in which two copies of the gene, one from each parent, are needed for the trait to be expressed in an individual.

Inheritance Pattern

Autosomal recessive traits are inherited in a recessive manner, meaning that both copies of the gene must be abnormal or mutated for the trait to manifest. If an individual inherits one normal copy of the gene and one mutated copy, they are considered carriers of the trait but do not exhibit any symptoms or characteristics associated with it.

Expression of the Trait

The expression of an autosomal recessive trait typically occurs when both copies of the gene are mutated or abnormal. Since individuals inherit two copies of each autosomal gene (one from each parent), it is possible to be a carrier of a recessive trait without actually displaying the trait. For the trait to appear, an individual must inherit two abnormal copies of the gene.

Examples of Autosomal Recessive Traits

Some examples of autosomal recessive traits include sickle cell anemia, cystic fibrosis, Tay-Sachs disease, and albinism. These conditions occur when an individual inherits two mutated copies of the gene associated with the respective disorder.