FAQ: One Problem With Adoption Studies Is That The Homes In Which Twins Are Placed?

What are the problems with twin studies?

The most common objections to twin studies have been: (1) Twins have almost always been reared to- gether and this common rearing may have con- tributed to increased concordance in monozygotic (MZ) twins because of psychological characteris- tics unique to such pairs (8, 29);

How are twin studies different from adoption studies?

In general, twin studies investigate the role of nature (genes) and adoption studies investigate the role of nurture (upbringing). Adoption studies and twin studies are always natural experiments.

Which of the following is a problem for the assumption that MZ and DZ twins are raised in equally similar environments?

The assumption that MZ and DZ twins are raised in equally similar environments can be problematic. Which of the following is a problem? MZ twins may share more of their environment than DZ twins.

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What is wrong with early twin studies?

Put another way, twin studies fail to separate the effects of genes and the prenatal environment. This failure casts doubt on claims of the relative effects of genes and environment on intelligence, psychiatric disorders, personality and other psychological variables, and other conditions.

Why are twin studies bad?

Although the authors of psychiatry and psychology textbooks and other mainstream publications usually endorse genetic interpretations of psychiatric twin studies uncritically, there is a fatal flaw underlying these studies: identical twin pairs grow up experiencing much more similar environments than experienced by

Why are twin studies unethical?

The study, which has since been criticized for being unethical — for example, neither the children’s biological parents nor the adopting families were informed — was an attempt to get at the central psychological questions of “nature versus nurture” and the “twinning reaction.”

How do twin studies explain crime?

Twin studies. Twin studies support the contention that a heritable trait may increase risk for criminal behavior.

What do adoption studies show?

Adoption studies are one of the classic tools of behavioral genetics. These studies are used to estimate the degree to which variation in a trait is due to environmental and genetic influences. Adoption studies are typically used together with twin studies when estimating heritability.

What are two problems with adoption studies of genetic influence?

The study found that a genetic influence, such as alcohol problems in first-degree (i.e., parents) or second-degree (i.e., grandparents) biological relatives, increased an adoptee’s risk for alcohol problems 4.6-fold.

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How does the environment affect twins?

Any differences between identical twins is expected to be due to environmental factors since they are genetically identical, whereas fraternal twins only share half of their genes on average. When an environmental influence is dominant, the trait similarity would be the same for identical and fraternal twins.

What are the applications of twin study?

Twin studies allow researchers to examine the overall role of genes in the development of a trait or disorder. Comparisons between monozygotic (MZ or identical) twins and dizygotic (DZ or fraternal) twins are conducted to evaluate the degree of genetic and environmental influence on a specific trait.

Why is study of identical twins effective in separating genetic vs environmental?

Twins are a valuable source for observation because they allow the study of environmental influence and varying genetic makeup: “identical” or monozygotic (MZ) twins share essentially 100% of their genes, which means that most differences between the twins (such as height, susceptibility to boredom, intelligence,

What are the limits of twin studies?

Limitations of twin studies Results from twin studies cannot be directly generalized to the general population, due to lack of randomization; in addition, they are different with regard to their developmental environment, as two fetuses growing simultaneously.

Are twin studies accurate?

Twin studies are pretty much useless. Researchers compare some behavior or trait in a set of pairs of monozygotic (identical) twins and a set of pairs of dizygotic (fraternal) twins. In theory, the siblings in each pair have been raised in the same way—i.e., they have “nurture” in common.

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Which of the following is a limitation of twin studies?

Which of the following is a limitation of twin studies? The samples are not representative. (Twins lead a very different life than the average child growing up. Therefore, they are not highly representative.

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