Guideline: Research studies done on identical twins ( describe design, sample and results) Twin studies are a special type of epidemiological studies designed to measure the
Research done on identical twins – describe design, sample and results
Research studies done on identical twins ( describe design, sample and results)
Twin studies are a special type of epidemiological studies designe d to measure the contribution of genetics as oppose d to the environment, to a given trait.
Despite the facts that the classical twin studies are still being in guide by assumptions made back in the 1920s and that the inherent limitation lies in the study design itself,
the results in suggestion by earlier twin studies have often been in confirmation by molecular
genetic studies later.
Use of twin registries and various innovative yet complex software packages such as the (SAS) and their extensions
(e.g., SAS PROC GENMOD and SAS PROC PHREG) has increase d the potential of
this epidemiological tool toward contributing significantly to the field of genetics and other life sciences.
The debate of nature versus nurture is know n since antiquity.
The close resemblance of twins has been the subject of many works of fiction as well.
Means of distinguishing between the effects of tendencies received due to genes at birth and those impose d
by the different environments they were expose d to during their lives after birth have always been the subject of interest to researchers.
The objection to statistical evidence in proof of the inheritance of peculiar traits has always been blame d upon similar environmental conditions playing as a confounder.(1)
Twin studies provide a strong basis for exploring the importance of any potential risk
factors on a trait or condition by controlling the genetic variations.
It has been one of the favorite research tools of behavioral geneticists and psychologists since long
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