One of the Better Methods Used to Obtain Precise Estimates

Multiple Choice

One of the better methods used to obtain precise estimates of genetic and environmental contributions to individual differences is the twin study, in which monozygotic twins and dizygotic twins of the same sex are compared to each other and to family members for:

A) differences in blood types only.
B) similarities in blood type only.
C) similarities on any given trait.
D) chromosomal defects.