The last contributor scientist feel triggers BPD is society. Psychologist believe modern society is a contributor because most people in our society today are less supportive and uncaring which leaves the children having difficulty with their needs for identity and attachment.
Sexual Preference.
Homosexuality is fully genetic. No one chooses to become a homosexual. Homosexuality is proven to be in all of your genetic make-up, and even in your brain. Most of the gay gene shows up in the X chromosome.
Scientist have found a high occurrence of homosexuals in families, which is why they believe homosexuality is hereditary. In a set of twin brothers, if one turns out gay there is a fifty-two percent chance that the other twin will become gay as well. When dealing with a set of fraternal twins, the chance of the other twin becoming gay is lessened to twenty-two percent, and when dealing with siblings the chance is only ten percent. Thirty-three percent out of forty pairs of homosexual brothers share the genetic markings on the Xq28 region of the X chromosome.
Having the gay gene does not always necessarily ensure you will become gay because the gene only has a fifty percent penetrance, which explains why not all siblings and twins with the gene become homosexuals. Although scientist are not a hundred percent sure why that is, they have come up with a few really good theories. The theory that homosexuality is triggered in the womb or during early childhood is one of the most accepted of the theories.
One of the most intriguing arguments about homosexuality being hereditary is when identical twins are separated at birth, and both of them turned out to be gay, but when it came to women, it is a different story, out of four pairs of female twins; there were none of them when both females were gay. Many leading scientist wonder why there is a less genetic similarity of lesbian women. Even when they did the Minnesota Twin Study, fifty-two percent of male twin brothers were both gay and only forty-eight percent of lesbian twin sisters turned out to be both gay.
