3 ms·

It will affect the environment of BOTH twins

• gpderetta 7y ago
  Isn't that the point of the parent?
  • barry-cotter 7y ago
    You can estimate true heritability by comparing fraternal and identical twins, both of which will have shared environment, but identical twins are identical genetically and fraternal ones are as similar as any other sibling pair.
    • gpderetta 7y ago
      right, the part that I missed is that they are also comparing non-twin siblings.
    • shusson 7y ago
      > You can estimate true heritability by comparing fraternal and identical twins Can you explain this a bit more?
      • barry-cotter 7y ago
        https://en.wikipedia.org/wiki/Twin_study https://en.wikipedia.org/wiki/Twin_study > The classical twin design compares the similarity of monozygotic (identical) and dizygotic (fraternal) twins. If identical twins are considerably more similar than fraternal twins (which is found for most traits), this implicates that genes play an important role in these traits. By comparing many hundreds of families with twins, researchers can then understand more about the roles of genetic effects, shared environment, and unique environment in shaping behavior.