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Related Concept Videos

Reproductive Cloning

Reproductive Cloning

Reproductive cloning is the process of producing a genetically identical copy—a clone—of an entire organism. While clones can be produced by splitting an early embryo—similar to what happens naturally with identical twins—cloning of adult animals is usually done by a process called somatic cell nuclear transfer (SCNT).
Somatic Cell Nuclear Transfer
In SCNT, an egg cell is taken from an animal and its nucleus is removed, creating an enucleated egg. Then a somatic cell—any cell that is not a sex...

Trihybrid Crosses

Trihybrid Crosses

Trihybrid Crosses
Some of Mendel’s crosses examined three pairs of contrasting characteristics. Such a cross is called a trihybrid cross. A trihybrid cross is a combination of three individual monohybrid crosses. For example, plant height (tall vs. short), seed shape (round vs. wrinkled), and seed color (yellow vs. green).
The F1 generation plants of a trihybrid cross are heterozygous for all three traits and produce eight gametes. Upon self-fertilization, these gametes have an equal chance to...

Cloning of Dolly the Sheep

Cloning of Dolly the Sheep

The first successfully cloned mammal was Dolly, a sheep, born on 5th July 1996 at Roslin Institute, Scotland. The cloned sheep was named after the American singer Dolly Parton. Dolly lived for seven years and died of respiratory complications, which is speculated to be due to the actual age of her DNA. Because the DNA in cloned cells belongs to an older individual, the cloned individual’s life expectancy may be affected. Indeed, analysis of Dolly’s DNA revealed shorter telomeres than other...

Test Cross

Test Cross

Alleles are different forms of the same gene. Humans and other diploid organisms inherit two alleles of every gene, one from each parent.

Sex Linked Disorders

Sex Linked Disorders

Like autosomes, sex chromosomes contain a variety of genes necessary for normal body function. When a mutation in one of these genes results in biological deficits, the disorder is considered sex-linked.

Karyotyping

Karyotyping

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Related Experiment Video

Updated: May 30, 2026

Model Surgical Training: Skills Acquisition in Fetoscopic Laser Photocoagulation of Monochorionic Diamniotic Twin Placenta Using Realistic Simulators

Model Surgical Training: Skills Acquisition in Fetoscopic Laser Photocoagulation of Monochorionic Diamniotic Twin Placenta Using Realistic Simulators

Published on: March 21, 2018

The Danish Twin Registry.

Axel Skytthe¹, Kirsten Ohm Kyvik, Niels Vilstrup Holm

¹The Danish Twin Registry, Epidemiology, Institute of Public Health, University of Southern Denmark, Odense, Denmark. askytthe@health.sdu.dk

Scandinavian Journal of Public Health

|July 22, 2011

Summary

The Danish Twin Registry, with over 85,000 twin pairs, is a valuable resource for studying genetic and environmental influences on health. Its population-based ascertainment enables research into various diseases and traits.

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Area of Science:

* Twin studies
* Genetic epidemiology
* Public health research

Background:

* The Danish Twin Registry is a unique resource for investigating genetic, familial, and environmental factors.
* Contains over 85,000 twin pairs born between 1870 and 2008 in Denmark.

Purpose of the Study:

* To highlight the utility of the Danish Twin Registry for diverse research applications.
* To underscore its suitability for disentangling genetic and environmental influences.

Main Methods:

* Utilizes four primary ascertainment methods.
* Ascertainment completeness varies by birth cohort (1870-1930 required survival to age 6; 72% ascertained for 1931-1968).
* Complete ascertainment of all live-born twins achieved since 1968.

Main Results:

* Ascertainment completeness has improved over time.
* Different birth cohorts have varying levels of data completeness.
* Comprehensive data collection established for recent cohorts.

Conclusions:

* The registry's population-based and trait-independent ascertainment is ideal.
* Facilitates research on the etiology of a wide range of diseases and traits.
* Essential for understanding the interplay of genetic and environmental factors.