When Dr. Hernandez compares happiness in a sample of fraternal and identical twins, she finds fraternal twins' scores on this trait differ a great deal, while identical twins' scores are virtually "the same." Dr. Hernandez would conclude that happiness is:
A) mainly genetic.
B) mainly environmental.
C) due to our upbringing.
D) greater for identical twins than fraternal twins.

Question

Quizplus · Accepted Answer

Dr. Hernandez's finding that identical twins' scores on happiness are virtually the same suggests a strong genetic component to this trait, as identical twins share 100% of their genetic material. The fact that fraternal twins' scores differ greatly suggests that environmental factors may play a larger role in their happiness levels. Therefore, Dr. Hernandez would conclude that happiness is mainly genetic.

When Dr Hernandez Compares Happiness in a Sample of Fraternal and and Identical