Answer:
The correct answer is **B.** In the 1990s, certain researchers thought they had discovered a genetic mutation that caused homosexuality in some men.
The idea of a "gay gene" has been around for decades, but it has never been proven. In the 1990s, a study by Dean Hamer suggested that a gene on the X chromosome might be linked to homosexuality in men. However, subsequent studies have failed to replicate these findings, and it is now widely accepted that there is no single "gay gene."
Sexual orientation is likely influenced by a combination of genetic and environmental factors. Some studies have found that identical twins are more likely to share the same sexual orientation than fraternal twins, which suggests that there is a genetic component to sexual orientation. However, environmental factors, such as upbringing and culture, also play a role.
The idea of a "gay gene" is often used to stigmatize and discriminate against LGBTQ+ people. It is important to remember that sexual orientation is a normal and natural variation of human sexuality. There is nothing wrong with being gay, lesbian, bisexual, or transgender.
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