A Scientific Examination of Homosexuality and the "Gay Gene"

"This is the Way God Made Me"--A Scientific Examination of Homosexuality and the "Gay Gene"

by	Dave Miller, Ph.D. Brad Harrub, Ph.D.

The trumpets were left at home and the parades were canceled. The press releases and campaign signs were quietly forgotten. The news was big, but it did not contain what some had hoped for. On April 14, 2003, the International Human Genome Consortium announced the successful completion of the Human Genome Project—two years ahead of schedule. The press report read: 

“The human genome is complete and the Human Genome Project is over” (see “Human Genome Report...,” 2003, emp. added). Most of the major science journals reported on the progress in the field of genetics, but also speculated on how the information would now be used. The one piece of information that never materialized from the Human Genome Project was the identification of the so-called “gay gene.”

Homosexuality has been practiced for thousands of years. Simply put, homosexuality is defined as sexual relations between like genders (i.e., two males or two females). It was Sigmund Freud who first postulated that parental relationships with a child ultimately determine the youngster’s sexual orientation. But this “nurturing” aspect has effectively given way to the “nature” side of the equation. Can some behaviors (e.g., alcoholism, homosexuality, schizophrenia) be explained by genetics? Are these and other behaviors influenced by nature or by nurture? Are they inborn or learned? Some individuals believed that the answer would be found hiding amidst the chromosomes analyzed in the Human Genome Project.

The human X and Y chromosomes (the two “sex” chromosomes) have been completely sequenced. Thanks to work carried out by labs all across the globe, we know that the X chromosome contains 153 million base pairs, and harbors a total of 1168 genes (see NCBI, 2004). The National Center for Biotechnology Information reports that the Y chromosome—which is much smaller—contains “only” 50 million base pairs, and is estimated to contain a mere 251 genes. Educational institutions such as Baylor University, the Max Planck Institute, the Sanger Institute, Washington University in St. Louis, and others have spent countless hours and millions of research dollars analyzing these unique chromosomes. As the data began to pour in, they allowed scientists to construct gene maps—using actual sequences from the Human Genome Project. And yet, neither the map for the X nor the Y chromosome contains any “gay gene.”

What is the truth regarding homosexuality? Too often, speculation, emotions, and politics play a major role in its assessment. The following is a scientific investigation of human homosexuality.

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BEHAVIORAL GENETICS AND CIVIL RIGHTS