The difference in the genetic relationship between two fraternal twins versus two identical twins is critical to behaviour genetics-based research because
A)identical twins have more canalized traits.
B)fraternal twins have significantly different environmental experiences.
C)identical twins are more genetically similar than fraternal twins.
D)fraternal twins have a much smaller range of reactions.

Question

Quizplus · Accepted Answer

The genetic relationship between two identical twins is much closer than that between two fraternal twins. Identical twins share 100% of their genetic material, whereas fraternal twins share an average of 50% of their genetic material. This makes it easier for researchers to isolate genetic influences on behaviour by comparing the similarities and differences in behaviour between identical and fraternal twins.

The Difference in the Genetic Relationship Between Two Fraternal Twins