Recessive allele

The recessive allele is the variation of a gene that is superceded by the dominant allele when determining the organism's phenotype. Most genes in organism presents in two copies, one from mother and one from father. Thus, both parents have to be carriers of a recessive trait in order for a child to express that trait.

The picture below shows the inheritance of the the recessive allele located on an autosome (non-sex chromosome).

Recessive gene in autosome