Recessive
The trait that will only be expressed if two alleles are present (aa)
Recessive is a term used to describe a type of genetic trait or disease that is only expressed when two copies of the same recessive gene are inherited. In other words, it is a characteristic that is not visible in a person even if they have one copy of the recessive gene.
For example, if a person inherits one copy of the recessive gene for a certain disease or trait but an alternative dominant gene for the same trait, they will not have the disease or trait. However, if two parents who are both carriers of the recessive gene have children, there is a chance that their offspring will inherit two copies of the recessive gene and therefore, express the trait or disease.
Recessive traits and diseases can be tested for using genetic testing or family history analysis, which can determine if an individual is a carrier of a recessive gene.
More Answers:
Understanding Diploid Cells and the Process of Meiosis in OrganismsUnderstanding Recessive Alleles in Genetics: How they Affect Phenotype and Inheritance.
Understanding Dominant Traits in Genetics: Definition and Examples