What evidence supports the belief that sexual orientation depends partly on genetic differences?

A) Most gay men have a gay father.
B) Most lesbian women have a lesbian mother.
C) Monozygotic twins overlap in sexual orientation more often than dizygotic twins do.
D) Three genes controlling orientation have been found, all on the Y chromosome.

Sexual Orientation

A person's pattern of emotional, romantic, or sexual attraction to others, which can include heterosexuality, homosexuality, bisexuality, and more.

Genetic Differences

Variations in the DNA sequences among individuals, which contribute to the diversity of organisms' traits and characteristics.

Monozygotic Twins

Twins that originate from a single fertilized egg, splitting and forming two individuals with nearly identical genetic makeup.