Imagine That Behavioural Geneticists Have Found a Way to Measure

Multiple Choice

Imagine that behavioural geneticists have found a way to measure the characteristic of having a "sweet tooth." The correlation between twin pairs is .95 for monozygotic twins and .90 for dizygotic twins.Based on this information, what would a behavioural geneticist conclude about the influence of genes and environment on this trait?

A) It is mildly influenced by genetics because the heritability coefficient is nearly 0.00.
B) It is mildly influenced by the environment because the heritability coefficient is nearly 0.00.
C) It is strongly influenced by genetics because the correlations are so high for both types of twins.
D) It is influenced about equally by genetics and by the environment because the correlations are nearly identical for both types of twins.