Asparagus urine. When viewed from above and behind the head, many people's hair whorls in either a clockwise CW or counterclockwise CCW direction. This is sometimes used to illustrate basic genetics; the myth is that whorl direction is controlled by a single gene with two alleles, and the allele for clockwise is dominant to the allele for counterclockwise. Several studies have data that fit this myth fairly well, but with enough exceptions that the myth can't be completely true. While hair whorl is occasionally used to illustrate basic genetics, it gets more attention because some studies have suggested that counterclockwise whorls are more common in left-handed people than in right-handed, and other studies have suggested that counterclockwise whorls are more common in gay men than in straight men. Other studies have given conflicting results, and it is not clear yet whether there is any relationship between hair-whorl direction and either handedness or sexuality.
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Your Good Health: Why is one ‘identical’ twin gay, the other straight?
Being Gay Not a Choice: Science Contradicts Ben Carson | Live Science
The hormonal theory of sexuality holds that, just as exposure to certain hormones plays a role in fetal sex differentiation , such exposure also influences the sexual orientation that emerges later in the adult. The hormonal theory of sexuality and gender identity holds that, just as exposure to certain hormones plays a role in fetal sex differentiation, such exposure also influences the sexual orientation and or gender identity that emerges later in the adult. Differences in brain structure that come about from chemical messengers and genes interacting on developing brain cells are believed to be the basis of sex differences in countless behaviors, including sexual orientation. As seen in young children as well as in vervet and rhesus monkeys, sexually differentiated behavior in toy preference is differing in males versus females, where females prefer dolls and males prefer toy balls and cars; these preferences can be seen as early as 3—8 months in humans. An endocrinology study by Garcia-Falgueras and Swaab postulated that "In humans, the main mechanism responsible of [ sic ] sexual identity and orientation involves a direct effect of testosterone on the developing brain.
Homosexual orientation in twins: a report on 61 pairs and three triplet sets
There are several studies that support biological underpinnings for trans identity. While environment can affect brain anatomy, it is fairly safe to say there are biological causes behind a trans or homosexual outcome, even if these identities can be affected by culture in some cases i. Birth order, in relation to older brothers, predicts both a trans identity and male homosexuality. Logistic regression showed that the transsexual group had significantly more older brothers and other siblings. These effects were independent of one another and consistent with previous studies of birth order and sexual orientation.
Spoiler Alert: The following article includes plot elements from the documentary, Three Identical Strangers. The film, directed by Tim Wardle and released across the United States in the past few weeks, tells a story some might remember from headlines in the s: Three college-aged identical triplets—Eddy Galland, David Kellman, and Robert Shafran—each put up for adoption, learn they were separated at birth and are reunited. It is almost too good to be true. Seeing the three hardy boys together, whether in New York Pos t photos , on prime-time TV shows, or in person at the Manhattan restaurant they ended up opening, was deeply heart-warming. The answers are worse than we might imagine.