Recessive

recessive allele
an allele that is expressed only in the homozygous condition
Source: Jenkins, John B. 1990. Human Genetics, 2nd Edition. New York: Harper & Row ...
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Definition of recessive :
An allele that is not expressed in the heterozygous condition. Also the phenotype of the homozygote of a recessive allele.
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The phenotype of a homozygote for the recessive allele; the parental phenotype that is not expressed in a heterozygote.
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z ...
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Recessive Genetic Disorder
In diseases associated with altered recessive genes, both parents -- although disease free themselves -- carry one normal gene and one altered gene.
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Dr. William Pavan, of the National Human Genome Research Institute's Laboratory of Genetic Disease Research, defines recessive.
illustrated:
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Recessive
The term which Mendel (1866) proposed for a character which was not evident in the first filial generation (F1) of a cross between two pure-breeding strains differing in respect of this character, ...
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recessive: the allele overshadowed by the dominant allele.
recombinant DNA: DNA molecules that have been altered in some way during the process of genetic engineering or biotechnology.
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recessive Refers to an allele of a gene that is expressed when the dominant allele is not present. An allele expressed only in homozygous form, when the dominant allele is absent.
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Recessive
A genetic trait that is not expressed in a heterozygous or partially heterozygous cell.
Recombinant DNA
A molecule of DNA in which a DNA fragment from a different source has been inserted.
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recessive allele
[L. recedere, to recede]
In a heterozygote, the allele that is completely masked in the phenotype.
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recessive trait A trait caused by an allele, the phenotype of which is suppressed when it occurs with the dominant allele. Hence, two recessive alleles are necessary for the recessive phenotype to be displayed.
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Recessive gene: A gene which must b e present on both chromosomes in a pair to show outward signs of a certain characteristic.
Recombinant DNA: A form of DNA produced by splicing together segments of DNA from two or more organisms.
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Recessive(-acting) oncogene, (anti-oncogene). A single copy of this gene is sufficient to suppress cell proliferation; the loss of both copies of the gene contributes to cancer formation. (See Oncogene.) ...
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Recessive: Allele that determines phenotype only when homozygous; does not affect phenotype when heterozygous with a dominant allele.
Recombinant clones: Clones containing recombinant DNA molecules. See recombinant DNA technologies.
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So, recessive genes do not tend to be lost from a population no matter how small their representation.
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PKU is a recessive genetic disease in which the person does not have the ability to break down the amino acid phenylalanine. The level of phenylalanine in the persons blood builds up and interferes with the development of the nervous system.
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Heterozygous recessive traits
In some instances, efforts to eradicate certain single-gene mutations would be nearly impossible.
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Genes named after recessive alleles begin with a lowercase letter, while dominant alleles begin with a uppercase letter. Genes named after a protein product begin with an uppercase letter. Genes are typically written in italics.
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See Recessive oncogene. Antisense RNA. A complementary RNA sequence that binds to a naturally occurring (sense) mRNA molecule, thus blocking its translation. (See RNA.) Asexual reproduction.
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Carrier -- an individual heterozygous for a single recessive gene. cDNA -- complementary DNA produced from a RNA template by the action of RNA- dependent DNA polymerase.
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Mutations in the AE1 gene cause autosomal dominant and recessive forms of dRTA. All the dominant dRTA mutations investigated cause aberrant trafficking of kAE1, resulting in its intracellular retention or mistargeting to the apical plasma membrane.
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Because the mutation is recessive, the trait is not expressed. Later a mutation occurs in the second copy of the gene in a somatic cell. In that cell both copies of the gene are mutated and the cell develops uncontrolled growth.
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The O allele is recessive. A and B alleles are codominant, meaning that the phenotype determined by these alleles is not masked by the presence of other dominant alleles.
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Where an individual receives one albinism gene and one normal gene, that person will not show outward signs of the condition, but will become a carrier of the recessive gene.
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: The production of a wildtype phenotype when two recessive mutations from different genes are brought together.
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In diploids, a deleterious recessive mutant may increase in frequency due to drift. Selection cannot see it when it is masked by a dominant allele. Many disease causing alleles remain at low frequency for this reason.
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When the alleles of a pair are heterozygous, one is dominant and the other is recessive. The dominant allele is expressed and the recessive allele is masked.
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