The largest genetic study ever conducted on the issue has that a person's attraction to those of the same sex is shaped by a complex mix of genetic and environmental influences, similar to what's seen in most other human traits - and there is no such thing as a single "gay gene".
from Health24 News https://www.health24.com/Medical/Genetics/News/science-puts-an-end-to-the-myth-there-is-no-single-gay-gene-20190830-2
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