QUEER SCIENCE UNDERWRITING QUEER THEORY?
Not really, it would seem.
This science would appear to suggest homosexuality is caused by hormonal imbalances in the mother’s womb.
This being the case, medical science in the near future may discover the pregnancy intervention required to lower the risk of a mother giving birth to a baby that grows up to be gay.
This science suggests that homosexuality can be viewed as a birth defect.
What are birth defects?
Birth defects are abnormal growth changes in your body that happen during fetal development. These changes can affect any part of your child’s body. A healthcare provider can detect birth defects during pregnancy, after your baby is born or later during your child’s life. Most providers identify a birth defect within your child’s first year. Not all birth defects are visible.
Question put to AI
Has science or evolutionary psychology yet solved the mystery as to why some boys become homosexual when their brothers with the same parents and upbringing, remain heterosexual?
Answer from Google AI
Science and evolutionary psychology have not completely "solved" the mystery, but they have uncovered concrete biological mechanisms-explaining why brothers from the same family can have different sexual orientations.
The primary breakthrough is that "upbringing" and "same parents" do not mean brothers experience identical biological environments.
The variation between brothers is driven by prenatal biology (womb environment), polygenic genetics, and epigenetics, rather than social or parental choices. L
1. The Leading Explanation: The Fraternal Birth Order Effect
The most robust biological phenomenon explaining difference among biological brothers is the Fraternal Birth Order Effect.
The Pattern: A man's probability of being gay increases by roughly 33% for each older biological brother he has from the same mother.
The Mechanism: This is driven by the Maternal Immune Hypothesis. During pregnancy, cells from a male fetus enter the mother’s bloodstream. Because the mother lacks a Y chromosome, her immune system recognizes male-specific proteins (specifically NLGN4Y) as foreign and creates antibodies against them.
The Impact on Later Brothers: With each subsequent male pregnancy, the mother's immune system retains a "memory" and produces these antibodies more efficiently. These antibodies cross the placenta and alter fetal brain development in later-born sons, shifting brain regions responsible for sexual attraction into a typical female arrangement (attraction to men).
Why it Accounts for Differences: An oldest brother is never exposed to these antibodies, while a younger brother is.
2. Genetic Architecture and Epigenetics
Even in the case of identical twins who share 100% of their DNA and the same womb at the same time, they do not always share the same sexual orientation (the concordance rate is roughly 50% to 65%). This is explained by two factors:
No Single "Gay Gene": Massive genome-wide association studies (GWAS) published in journals like Science prove that homosexuality is polygenic. It is influenced by thousands of tiny genetic variants, each contributing a small percentage. Brothers—even fraternal twins—inherit different random combinations of these variants from their parents.
Epigenetics ("Epi-marks"): Epigenetics refers to how genes are turned on or off by temporary chemical layers called epi-marks. Scientists hypothesize that prenatal epi-marks protect a fetus from fluctuating hormone levels in the womb. If these epi-marks are randomly triggered in one brother but not the other, it can fundamentally change how his brain reacts to testosterone during critical developmental windows.
3. The Evolutionary Psychology Paradox
From an evolutionary standpoint, a trait that reduces direct reproduction should theoretically fade away. Evolutionary psychologists have proposed two leading models to explain why these biological pathways persist:
The Kin Selection Hypothesis ("Helpers in the Nest"): This theory suggests that homosexual individuals pass on their family genes indirectly.
By not having their own children, gay brothers can invest resources, protection, and care into their nieces and nephews, who share 25% of their DNA, thereby boosting the reproductive survival of the family line.
Sexually Antagonistic Selection: This theory posits that the same genetic variants or immune responses that cause homosexuality in males actually increase fertility and reproductive output when expressed in females. Therefore, the genes are heavily selected for by evolution through the highly fertile female relatives of gay men.
If you would like to explore this topic further, let me know if you want to look closer at how twin studies calculate heritability, or how researchers studied the maternal immune response in laboratory settings.
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