| -Caveat Lector-
Evidence Homosexuality Genetic
20-Sep-2002 A change in temperature is all it takes for
genetically- engineered male flies to switch from being heterosexual to
homosexual. The change occurs within minutes and is reversible. This discovery
will help scientists figure out how the brain may be involved in determining
sexual orientation. Some of the neurons affected are involved in sensing
pheromones, which play an important role in fly courtship behavior, but their
influence in human sexual behavior is still unknown. Dean Hamer of the NIH says
scientists should now try to find the genes that determine sexuality in mammals,
since homosexual behavior is widespread among animals, suggesting a strong
genetic influence. Hamer's team has published two highly controversial studies
suggesting there’s a "gay gene" on human chromosome X, although a different
group failed to reproduce their results.
It has been previously suggested that some regions
of the nervous system are connected to sexual orientation. Researcher Toshihiro
Kitamoto genetically engineered flies especially to test the genetic theory of
homosexuality. The mutation is temperature sensitive, meaning neurons carrying
the mutation suddenly become inactive above 30°C. At the normal 19°C, males are
heterosexual. But when they’re heated above the critical temperature, their
behavior changes in about two minutes.
Kitamoto doesn’t know why the flies change their
sexual preference so quickly. When put in a chamber with virgin females, the hot
males remain uninterested, but when the hot flies are added to a vial with other
males, they pursue them vigorously. When the temperature is turned back to
normal, the flies become heterosexual again.
Think you’re being manipulated - sexually, or
otherwise?
In areas of cold climate would it be fair to say
there are fewer Homo's?
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