Suppose a Researcher Studied the Occurrence Rates of a Specific

Multiple Choice

Suppose a researcher studied the occurrence rates of a specific mental illness in monozygotic and dizygotic twins.She finds that in monozygotic twins,if one twin suffers from mental illness,the other twin is also likely to have the mental illness.However,this does not appear to apply to dizygotic twins.What conclusion should the researcher draw from this evidence?

A) The incidence of this type of mental illness is strongly influenced by genetics.
B) The incidence of this type of mental illness is primarily influenced by environmental factors.
C) Monozygotic twins are at an increased risk of developing mental illness.
D) Dizygotic twins are at an increased risk of developing mental illness.