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So, I'm just wondering about this because I read the following in my Biology textbook about fruit fly genes:

"Normal male and female flies express distinct forms of the fru gene. When females are genetically manipulated to express the male form of fru, they court other females, performing the role normally played by the male..."

Out of curiosity, have any studies been conducted to see what causes homosexuality? Is there a similar gene in humans that, if randomly altered, causes attraction to same-sex individuals?

EDIT: a similar post exists, but nobody provided an answer related to the poster's question.

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  • $\begingroup$ The phrasing suggest some misunderstanding of what genetic cause could mean. On this answer I linked a number of posts where I explain the concepts of heritability (which is related to this misunderstanding even if it is not necessarily obvious to you right now). $\endgroup$ – Remi.b Dec 8 '15 at 0:05