Homosexuality

“A Linkage Between DNA Markers on the X Chromosome and Male Sexual Orientation” (1993), by Dean H. Hamer and Charles A. Thomas.

The link Between DNA Markers on the X Chromosome and Male Sexual Orientation (1993)

In 1993, Dean H. Hamer and colleagues in the US published results from their research that indicated that men with specific genes were more likely to be homosexual than were men without those genes. The study hypothesized that some X chromosomes contain a

Franz Josef Kallmann (1897–1965)

Franz Josef Kallmann (1897–1965)

Franz Josef Kallmann studied the biological and genetic factors of psychological disorders in Germany and the United States in the twentieth century. His studies at the New York State Psychiatric Institute in New York City, New York, focused on the genetic factors that cause psychiatric disorders. Kallmann was one of the first to use twins to study how a mental disorder is passed on by comparing the occurrence of epilepsy and schizophrenia in both

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