Tandem repeat facts for kids
An example would be: ATTCG ATTCG ATTCG in which the sequence ATTCG is repeated three times.
When exactly two nucleotides are repeated, it is called a dinucleotide repeat (for example: ACACACAC…).
When three nucleotides are repeated, it is called a trinucleotide repeat (for example: CAGCAGCAGCAG…). Abnormalities in such regions can give rise to trinucleotide repeat disorders.
The repeat unit copy number may be variable. This is a variable number tandem repeat (VNTR).
A tandem repeat pattern helps determine an individual's inherited traits. Tandem repeats can be very useful in determining parentage. Short tandem repeats are used for certain genealogical DNA tests.
Tandem repeat Facts for Kids. Kiddle Encyclopedia.