If fraternal (or dizygotic) twins are more likely to be concordant for a trait than other siblings, can it be concluded that the higher concordance rate is due to the greater degree of genetic relatedness?
A) Yes.
B) Yes, but only if the siblings studied are of the same sex and age.
C) No, because the greater similarity can be attributed to environmental influence.
D) No, because fraternal twins are no more genetically alike than other siblings.

Question

Quizplus · Accepted Answer

Fraternal twins share, on average, 50% of their genes, just like any other siblings. The higher concordance rate for traits among fraternal twins compared to other siblings is not due to greater genetic relatedness but can be attributed to shared environmental factors and experiences, as they are born and raised in the same environment at the same time.

If Fraternal (Or Dizygotic) Twins Are More Likely to Be