recessive characters
those traits that are not expressed, even though their genes are present together with the gene for the opposite dominant allele
Source: Noland, George B. 1983. General Biology, 11th Edition. St. Louis, MO. C. V. Mosby ...
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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.
An allele that is not expressed in the heterozygous condition. Also the phenotype of the homozygote of a recessive allele.
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Recessive
Recessive is a quality found in the relationship between two versions of a gene. Individuals receive one version of a gene, called an allele, from each parent.
Recessive Genetic Disorder
In diseases associated with altered recessive genes, both parents -- although disease free themselves -- carry one normal gene and one altered gene.
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.
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.
recessive allele
[L. recedere, to recede]
In a heterozygote, the allele that is completely masked in the phenotype.
reciprocal altruism ...
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.
Recessive A mutation or allele which does not affect the phenotype unless it is homozygous.
Reciprocal translocation A chromosomal rearrangement in which material is exchanged between two nonhomologous chromosomes.
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.) ...
Recessive
A genetic disorder that appears only in individuals that have received two copies of a mutant gene, one from each parent. [Talking Glossary]
Recombinant DNA ...
Recessive gene
A gene which will be expressed only if there are 2 identical copies or, for a male, if one copy is present on the X chromosome.
Reciprocal translocation ...
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, ...
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.
Recessive - a term applied to a trait that is only expressed when the second allele is the same (e.g. short plants are homozygous for the recessive allele).
Phenotype - the physical expression of the allelic composition for the trait under study.
So, recessive genes do not tend to be lost from a population no matter how small their representation.
The recessive mutant gene mc produces the blotched or classic tabby pattern.
Brown Mackerel tabby cat with pencil lines on the face.
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.
AUTOSOMAL RECESSIVE INHERITANCE (AR)
Examples of AR traits are albinism, sickle cell disease, galactosemia and phenylketonuria (PKU). The last three disorders are tested for in the new born screening in most states including California.
E. only recessive traits are scored.
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Dominant and Recessive Alleles
Mendel paved the way to discovering that alleles that code for a particular characteristic, such as the shape of the seeds produced are expressed in dominant and recessive genes.
Dominant allele: An allele that masks an alternative allele when both are present (in heterozygous form) in an organism (see recessive).
monohybrid dominant/recessive cross
Related Terms:
Crossing
Fertilization of an organism from an other organism with a different genetic constitution. Cf. Selfing.
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.
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.
Carrier (heterozygote) An individual who carries one copy of a recessive gene.
cDNA See complementary DNA.
Cell The basic structural unit of all living organisms.
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.
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.
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.
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.
When there are two different kinds of genes (a tall, and a short) the dominate gene will determine how the plant will grow. In pea plants, the tall gene is dominate, while the short gene is recessive.
incompletely dominant An allele combination that produces a phenotype in the heterozygous state that is distinct from the dominant homozygote and the recessive homozygote phenotypes. Also known as semi-dominant.
 See also: Gene, Organ, Human, Chromosome, Dominant
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