Twin studies indicate that
a. there is a genetic basis for homosexuality in males as well as in females.
b. identical male twins are less likely to be concordant for homosexuality than are fraternal male twins.
c. a male child whose older twin sisters are heterosexual is more likely to be homosexual.
d. homosexual women are likely to have homosexual male relatives.
e. early family environment is more important than genes for the development of homosexuality.
Answer: a. there is a genetic basis for homosexuality in males as well as in females.
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