Epigenetics is the study of how gene expression may be regulated by temporary DNA switches called "epi-marks. For decades, there have been indications that homosexual orientation is determined before birth. The most convincing proof involves studies of twins. Although this indicates that DNA is somehow involved in homosexual and bisexual orientation, the precise mechanism has remained a mystery.
"Epi marks homosexuality and christianity" No "smoking gun" has been found so far. In spite of massive research efforts, no gene or group of genes has been definitively proven to be the direct cause of the three sexual orientations: It would appear that a simple "gay gene" or set of "gay genes" that directly cause homosexuality may never be found because they may not exist. Many commentators believe that homosexuality is determined after birth, either because of some factor in a persons upbringing or because of having been sexually assaulted at a young age.
They have noted that the Darwinian theory of natural selection is based on the survival of the "fittest," where fittest is defined as those members of a species that have the largest number of offspring.
They are the individuals that most successfully pass their genes on to the next generation. Gays and lesbians, by definition, are not sexually Epi marks homosexuality and christianity to members of the opposite sex and thus tend to have many fewer offspring who are genetically related to them. Bisexuals are attracted to both the same and opposite sex, but not necessarily to the same degree. Thus both homosexuals and bisexuals tend to procreate less. Heterosexuals would simply outbreed homosexuals and bisexuals.
But every society on earth appears to have a more or less a stable and similar percentage of gays and lesbians from generation to generation. Some believed that the theory of natural selection proved that homosexuality is determined from something in the environment after birth. However, the natural selection argument was weakened or eliminated when it was found that female relatives of homosexuals tend to have more children than average.
That is, the same genetically-related cause that produces homosexuality in some people also appears to increase fecundity in female relatives. This increased the support that homosexuality has some type of genetic cause.
But the exact cause remained a mystery because:. They issued a report on epigenetics. Associated with the report is a mathematical model that shows how epi-marks before birth might play a major role in determining a person's sexual orientation and perhaps even gender identity and the occurrences of intersexuality!
The hypothesis we put forward is based on epigenetic marks. According to a NIMBios article:.
While genes hold the instructions, epi-marks direct how those instructions are carried out -- when, where and how much a gene is expressed during development. These epi-marks are normally specific to the gender of the fetus.
They are produced early in gestation, during the embryonic stage of development. The speculation is that some epi-marks " That is, they also determine the person's sexual orientation.
If this is true, then epi-marks may play a role in intersexuality, gender identity, and sexual orientation. An inexact parallel would involve a computer.
The DNA corresponds to a computer program while the epi-marks correspond to the operating system. If there is a connection between epi-marks and homosexuality, it would be a remarkable development. It would prove some beliefs of many religious conservatives to be invalid.
Certain epi-marks become active later in pregnancy when they control the reaction of the fetus to normal fluctuations in testosterone levels.
In the case of a female fetus, with XX sex chromosomes the epi-marks prevent her from becoming masculinized during intervals of high testosterone. For male fetuses, typically with XY sex chromosomes the epi-marks prevent him from becoming feminized during intervals of low testosterone. Normally, these epi-marks are eventually inactivated or "erased" during conception. Epi marks homosexuality and christianity are not typically present to be transmitted from generation to generation.
However, rarely, it is possible for these particular epi-marks to be passed on at conception:. In both cases, the normal effects of the epi-marks would be reversed. Gavrilets explained in a Quarterly Review of Biology article:.
I don't think there's any other theory that for both. He is apparently using the term "theory" in its popular sense to refer to a hypothesis, speculation, assumption, or presupposition.
Usually, in science, the term is used to refer to a hypothesis that has been thoroughly tested, is proven to be accurate, and widely assumed by scientists to be true. If an epi-mark inverts the gender to which the fetus will be attracted later in life, then a newborn may result who discover that she or he is gay, lesbian, or bisexual later in life.
Similarly, if an epi-mark inverts the gender by which the fetus will identify themselves later in life, then baby many be born who will eventually be transgender. Co-author of the study, Sergey Gavrilets, said that this relatively rare:.
The report's abstract says in part:. The following information sources were used to prepare and update the above essay. The hyperlinks are not necessarily still active today. Study 17 into the cause s of sexual orientation: Nurture Part 1 of three parts Epigenetics: A promising theory that homosexual and bisexual orientation have Epi marks homosexuality and christianity cause indirectly related to genes: This topic is continued from an earlier essay Study If a set of twins is identical, then their DNA will be identical because they both originate from a single ovum and spermatozoon that splits in two after conception.
This is about the occurrence in the general population. But the exact cause remained a mystery because: DNA may not be directly involved, or scientists would probably have been able to isolate the gene or group of gene causing homosexual orientation.