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The use of twins can improve the statistical power of a genetic study by reducing the amount of genetic and/or environmental variability. [1] " Identical twins" (monozygotic (MZ) twins) share virtually all their genes with each other, and "fraternal twins" (dizygotic (DZ) twins), on average, share about 50% of their genes with each other (about the same amount of sharing as non-twin siblings).
The Vietnam Era Twin Registry (abbreviated VET Registry) is a twin registry containing 7,369 male-male twin pairs who served in the United States Armed Forces during the Vietnam War (defined as the period from 1964 to 1975). As of 2013, it is one of the largest national adult twin samples in the United States. [1]
Its original goal was to establish a registry of all twins born in Minnesota from 1936 to 1955 to be used for psychological research. Recently, it has added twins born between 1961 and 1964. It primarily conducts personality and interests tests with its 8,000+ twin pairs and family members via mail.
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The MSUTR Child Twin Study is an ongoing study that will ultimately result in a sample of approximately 500 same-sex female twins and 500 same-sex male twins between the ages of 6 and 10 years old. This study aims to examine the ways in which genes and risk experiences (e.g., peer pressure ) interact in the development of acting-out behaviors ...
It includes over 86,000 twin pairs, making it one of the largest twin registries in the world, [1] [2] and it is considered to be representative of the general population of Denmark. [3] It includes biological data and repeated measurements from the same subjects, as well as information from other national registers in Denmark.
The Swedish Twin Registry (abbreviated STR) is a twin registry based at the Karolinska Institutet in Stockholm, Sweden. Originally established in the 1960s, it is the largest twin registry in the world. It is widely used for medical research, with about thirty active research projects using data from the study as of 2019. [1]
TwinsUK, also known as TwinsUK Registry, is the biggest UK adult registry of twins in the United Kingdom, ages 16 to 98 to study the genetic and environmental aetiology of age related complex traits and diseases. [1] Established in 1993, it is based at King's College London with an intent of aiding genetic research. The registry is used to ...