1) Latent hereditary element 
Allele which in the heterozygous state is expected to have no effect on the phenotype of the organism which carries it. After [9]
An allele whose expression is over-ridden by another at the same locus. The allele who's expression vanishes in the F1, but appears in the F2.
Recessive genes affect the phenotype only when present in a homozygous condition. Recessive genes must be received from both parents before the phenotype caused by the recessive genes can be observed. 
Characterized as having a phenotype expressed only when both copies of the gene are mutated or missing.
A gene that is expressed onlywhen it is present in two copies or if theother copy is missing. ... (09 Oct 1997) ... 
recessive allele.
A gene which will be expressed only if there are 2 identical copies or, for a male, if one copy is p
A gene that can be expressed only when both members of a chromosome pair contain the same allele for a given characteristic (i.e., the same allele must be inherited from both the dam and the sire).
[n] - gene that produces its characteristic phenotype only when its allele is identical
a gene that does not produce its effect when it occurs with a dominant gene, but produces its effect only when there are two copies of it 
noun gene that produces its characteristic phenotype only when its allele is identical; `the recessive gene for blue eyes`
Allele (alternative form of a gene) that will show in the (phenotype observed characteristics of an organism) only if its partner allele on the paired chromosome is identical. Such an allele will not show if its partner is of a different, dominant type, that is if the organism is heterozygous for a particular characteristic. Alleles for blue eyes i...
A gene that is phenotypically expressed in the homozygous state but has its expression masked in the presence of a dominant gene.
A gene which must be present on both chromosomes in a pair to show outward signs of a certain characteristic.
A gene that is expressed when present in only its homozygous form.