Recessive trait
a genetic factor that is blocked by the presence of a dominant trait
A recessive trait is a genetic trait that is expressed only when an individual receives two copies of the recessive gene, one from each parent. In other words, the presence of a dominant gene will take precedence over a recessive gene, as it will be expressed in the phenotype whether it is paired with another dominant or recessive gene.
For example, if a person inherits a recessive gene for blue eyes from both parents, they will have blue eyes, as the dominant gene for brown eyes is not present to overpower it. However, if a person inherits a dominant gene for brown eyes from one parent and a recessive gene for blue eyes from another parent, they will have brown eyes, as the dominant gene takes precedence.
Recessive traits are often inherited in families without being expressed for generations, as carriers of the recessive gene do not outwardly display the trait. Recessive traits can include physical characteristics such as eye color or hair color, as well as genetic disorders such as cystic fibrosis or sickle cell anemia.
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