genteic trait that appears only when both of its corresponding alleles are identical and in the absence of its dominant counterpart allele For example, the recessive trait of blue eyes will only appear in persons only if both parents pass on blue-eye genes Otherwise, a dominant brown-eye gene will subordinate the blue eye and the offspring will be brown -eyed
an allele that is present in the genotype of an organism but may be masked in the phenotype of that organism by the presence of a dominant allele Submitted by Amy Franzen, franzena@pilot msu edu
A relative term describing the relationship of one allele to a second at the same locus when an animal heterozygous for these alleles expresses the same phenotype as an animal homozygous for the second allele The second allele of the pair is considered dominant See Recessive in the MGI Glossary
A recessive gene produces a particular characteristic only if a person has two of these genes, one from each parent. Compare dominant. Sickle-cell anaemia is passed on through a recessive gene. a recessive gene is passed to children from their parents only if both parents have the gene dominant
A term used to describe the degree of penetrance of an allele relative to other allels of the same gene A recessive trait is only expressed when there are two recessive alleles present If a dominant allele and recessive allele are both present, the dominant trait will be expressed instead