Recessive trait

dom·i·nance of traits

an expression of the apparent physiologic relationship existing between two or more genes that may occupy the same chromosomal locus (alleles). At a specific locus there are three possible combinations of two allelic genes, A and a: two homozygous (AA and aa) and one heterozygous (Aa). If a heterozygous individual presents only the hereditary characteristic determined by gene A, but not a, A is said to be dominant and a recessive; in this case, AA and Aa, although genotypically distinct, should be phenotypically indistinguishable. If AA, Aa, and aa are distinguishable, each from the others, A and a are codominant.

recessive trait

an inherited characteristic that is determined by a recessive allele.

dom·i·nance of traits

(dom'i-năns trāts)
An expression of the apparent physiologic relationship existing between two or more genes that may occupy the same chromosomal locus (alleles). At a specific locus there are three possible combinations of two allelic genes, A and a: two homozygous (AA and aa) and one heterozygous (Aa). If a heterozygous individual presents only the hereditary characteristic determined by gene A, but not a, A is said to be dominant and a recessive; in this case, AA and Aa, although genotypically distinct, should be phenotypically indistinguishable. If AA, Aa, and aa are distinguishable, each from the others, A and a are codominant.

Recessive trait

An inherited trait that is outwardly obvious only when two copies of the gene for that trait are present—as opposed to a dominant trait where one copy of the gene for the dominant trait is sufficient to display the trait. The recessive condition is said to be masked by the presence of the dominant gene when both are present; i.e., the recessive condition is seen only in the absence of the dominant gene.
References in periodicals archive ?
Winchester syndrome is an extremely rare disorder inherited as an autosomal recessive trait.
htm) blue eye color  is also a recessive trait, meaning both parents must carry the gene for a child to have it.
5) Although the only culprit in this disorder is CLNC1, different mutations in this gene can cause autosomaldominant (Thomsen disease, OMIM 160800) or recessive trait (recessive generalized myotonia or Becker myotonia, OMIM 255700).
Transmission of dCMP and AHT in this family could not only follow a maternal trait but also an autosomal dominant or even autosomal recessive trait of inheritance.
Thrombocytopenia and Absent Radius syndrome (TAR) is a rare genetic disorder, which is inherited as an autosomal recessive trait.
The rarest combination is a person with red hair and blue eyes, which also are a recessive trait.
This limited panel would suffice to classify the SCID into T-, B+, NK+/-, or T- B- NK+/- types, [gamma] chain deficiency is the only T- B+ NK- SCID type [Figure 1] that is inherited in an X-linked manner, while others such as JAK3, IL7R[alpha], CD45, and Coronin-1 A follow the autosomal recessive trait.
Of course, both alleles at a given locus must be recessive in order for the recessive trait to be manifested.
Papillon-LefAvre syndrome is an extremely rare genodermatosis inherited as an autosomal recessive trait affecting children between the ages 1-4 years.
Alkaptonuria is a rare pathologic condition that is passed as an autosomal recessive trait in most cases.