Dictionary > Tandem repeat

Tandem repeat

Definition
noun, plural: tandem repeats
(molecular biology) A type of repeated sequence in which the copies are repeated one after another along a chromosome
Supplement
The repeated sequences occur as multiple copies of nucleic acids in the genome. These repeats may involve the DNA or the RNA. There are three major types of repeated sequences: (1) terminal repeats, (2) tandem repeats, and (3) interspersed repeats.
Tandem repeats are repeated nucleotide sequences in which the copies lie adjacent to each other. It may be repetition(s) of one or more nucleotides. For example, CG CG CG CG CG is a tandem repeat wherein the sequence CG is repeated five times.
Tandem repeats include satellite DNAs, microsatellites, and minisatellites. Satellite DNA is a tandem repeat wherein the DNA copies are chiefly non-coding. It is present mainly in the centromere and heterochromatin. A microsatellite is a small tandem repeat ranging in length from 1-6 or more base pairs, repeated typically five to fifty times. A minisatellite is also a small tandem repeat but with relatively longer base pairs, i.e. from 10 to 60 base pairs, repeated typically five to fifty times.
Examples of tandem repeats are the 40S rRNA genes in somatic cells of toads, of which there are about 500 copies.
See also:


You will also like...

takahē
Takahē (Porphyrio hochstetteri)

Meet the colorful takahē, an extremely rare flightless bird. Find out more about its unique features and why they matte..

primitive arthropods
Arthropods

The arthropods were assumed to be the first taxon of species to possess jointed limbs and exoskeleton, exhibit more adva..

Buttress roots
Roots

This study guide tackles plant roots in greater detail. It delves into the development of plant roots, the root structur..

A sperm cell fertilizing an ovum
Human Reproduction and Fertilization

For human species to obviate extinction, reproductive mature adults should be producing viable offspring in order to con..

DNA molecule
Genetic Control – On and Off Genes

Genes are the blueprint of our bodies, a blueprint that creates a variety of proteins essential to any organism's surviv..

Direct and indirect physiologic effects of growth hormone
Animal Growth Hormones

Hormones are produced in the endocrine glands of animals. The pituitary gland and hypothalamus are the most impor..

Related Articles...

No related articles found

See all Related Topics