Concordance rates in twin studies measure what?

Concordance rates in twin studies measure what?

• A. The rate of genetic mutation
• B. The rate of gene expression
• C. The similarity of a trait between twins
• D. The rate of brain activity

Answer: (C)

Concordance in twin studies is about how similar twins are for a given trait. It’s the likelihood that one twin has the trait when the other twin also has it. This statistic helps researchers gauge genetic influence: if identical twins, who share nearly all their genes, show higher concordance than fraternal twins, that points to a genetic component. It doesn’t measure how often genes mutate, how genes are expressed, or brain activity. So the idea is simply the degree of similarity between twins for that trait.

Concordance in twin studies is about how similar twins are for a given trait. It’s the likelihood that one twin has the trait when the other twin also has it. This statistic helps researchers gauge genetic influence: if identical twins, who share nearly all their genes, show higher concordance than fraternal twins, that points to a genetic component. It doesn’t measure how often genes mutate, how genes are expressed, or brain activity. So the idea is simply the degree of similarity between twins for that trait.