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Description:They also had a special phone booth installed in their home that allowed one twin to talk intimately with a lover without the other hearing. Like all behavior genetic research, the classic twin study begins from assessing the variance of a behavior called a phenotype by geneticists in a large group, and attempts to estimate how much of this is due to: Artificial induction of ovulation and in vitro fertilization - embryo replacement can also give rise to fraternal and identical twins. Twins are not a random sample of the population, and they differ in their developmental environment. This represents only a sub-set of the possible genetic and environmental relationships. It is fair to say, therefore, that the heritability estimates from twin designs represent a first step in understanding the genetics of behavior. Heritability is the standardised genetic effect.

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