Zebra Finch Model

3. Based on the nature theory homosexual behavior in men and women can be related to hormonal imbalance. Sexual orientation is determined by the early levels (probably prenatal) of

One theory that many psychologist and scientist are trying to prove is that homosexuality has a fundamental biological basis. Similar to most mammalian species, humans at conception are females (McKnight 22). Toward the end of the first trimester is when the babies with a “male genetic message” begin to have small doses of two hormones, chorionic gonadotropin and luteinizing hormone, which start the altering process of the gonads into testes (McKnight 22). The hormones two jobs are to control the sexual development and control their function (McKnight 22). When the brain starts to develop masculine characteristics and lose the feminine characteristics, the processes are separate and occur at different

A pattern emerges where the scholarly literature exploring this topic is largely focused on males. Reason being is that it appears that males are the sex who are predominantly homosexual in their orientation (LeVay & Baldwin, 2012). However, the sensitivity within the discourse of sexual orientation arises when it is debated upon whether one 's sexual preference is innate at birth, hence a force of nature or biology, or if it is a result of culture, nurture or environmental factors (Emmanuele et al., 2010). Furthermore, an experimental design will be proposed to further examine this topic. Comparing the three chosen studies, it is evident that a biological and endocrinological perspective does account for sexual orientation (Kraemer et al., 2006; Manning et al., 2007; Miller et al., 2008). Of the studies that currently exist on this topic, data shows that prenatal testosterone levels are indicative of sexual orientation (Kraemer et al., 2006; Manning et al., 2007; Miller et al., 2008). This paper addresses a topic that is relevant in today 's society; a topic that has, for the most part, been written off as having any scientific roots (Emmanuele et al., 2010). This paper counters that belief and in reading this essay, it will be evident that biology and endocrinology have a much stronger influence on sexual orientation than previously thought.

He contradicted the argument that homosexual behaviour is related to genetic, hormonal or biological disorder. To abolish these views, the author mentions that ‘no school of medicine, medical journal or professional organization has ever recognized such claims (p. 2) - at least at the time he wrote the article in 1994.

Atticus “Oneshot” Finch , at the ripe old age of 72, took his last breath when his plane flying over the Sierra Nevada Mountains in Northern California, was struck by lightning on Saturday, November 12, 1955.

In 1991, Simon LaVey published scientific findings, that suggested: “sexual orientation has a biological substrate” (par 22). According to his research, the nucleus of the anterior hypothalamus (INAH-3), is considerably smaller than those seen in heterosexual men. In 1993, a study done by Dean Harmer found if there are more gay relatives on the mother’s side than the father’s side, the X chromosome can influence a male to become straight. This gene, Xq28, was found in 33 out of 40 gay brothers, therefore influencing a future sexual orientation. However, there have been other studies shown that there is no X gene connecting the sexual orientation of males. Another issue in the scientific community is not being able to agree what homosexuality is in the first place. The search for the Xq28 gay gene assumes that homosexuality is not a default, almost like a genetic mutation for a maturing human. The assumption that something awkward happened when humans were developing in the womb. The search for the gay gene could be an excuse for the cure for homosexuals. Not only that, but parents could design their babies to not be

·         Since 1973, how does the American Psychiatric Association view homosexuality? (Page 221) A normal variant of sexual orientation

To tie everything together, an article posted by BBC News throws a wrench in the works. In “Scans see ‘gay brain differences’”, the author talks about a Swedish study regarding brain anatomy. In this study, scientists found that the brain hemisphere sizes of lesbians and straight men & straight women and gay men were similar. Also, there were similar nerve connections to the amygdala in the same groups of men and women of different sexualities. These sizing and nerve connection differences can happen both during the development and after birth through environmental factors. Therefore, this study supports both nature and

revert back to square one, the common rock pigeon. Darwin eventually formed the argument that natural selection is the best at forming matches, as those who make poor mating choices will produce offspring that may not survive or reproduce, while individuals who make wise mating choices will produce offspring that is fit enough to survive and reproduce. It was important that individuals learned to discriminate against the old line and breed with the new one. Darwin noticed this discrimination with pigeons but not so much with his famed finches. Mating season among Darwin’s finches is met by a sort of ritual performed by the finches who are ready to mate. A male sings from his singing post to advertise himself to females. If a female comes he flies to her to examine her, to make sure she is one of his own kind. He flies to a nest he built and goes in and out, occasionally picking up some grass. If the female hops toward him a “sex chase” ensues, in which the male chases the female around his territory. In the rare occasion a male and female of the wrong species have courted each other, one of them will break it off. The finches typically have a very good ability to tell each other part despite looking ,mostly the same and all having the same way of courting. One slightly distinct thing is the male finch’s song, as there are typically two versions. Laurene Ratcliffe has been able to find that the finch’s songs have very subtle deviations. These deviations are usually passed

Other studies conducted suggest that homosexuality might be base on difference in the brain structure of homosexual and heterosexual males. In 1991, Simon LeVay, a researcher at salks institute for biological studies in San Diego, found that an area of the brain called INAH-3 was larger in heterosexual men as in homosexual men [6]. INAH-3 is a small cell cluster in the hypothalamus that is involve regulating male sex behavior. LeVay’s finding provided clues that prove that sexual attraction to some extent might be biological. Other studies following levay’s study suggest that homosexuality might be base on genetic. It is believe that “gay gene” is passed from mother tho son.

Dr. LeVay did a research and study about the brain to figure out the cause and the differences in the sexual orientation of the different people (LeVay &Valente, 2006). The main focus of his study was the brain of the homosexual and heterosexual individuals. Dr. LeVey’s research was

Looking at male and females we can see the noticeable physical differences between the two sex, but besides exterior differences, there are subtle but significant differences within the brain. Spasificly INAH3 which is called “third interstitial nucleus of the anterior hypothalamus” which is typically about two to three times larger

This question has been asked for many years: is being homosexual a decision, or are people born that way? During the1990’s people thought it was an illness or a disgrace to the family, but now homosexuals are perceived differently due to studies. Neuroscientists of the Christianity Today Newspaper, argue that homosexuality can be a natural response of the hypothalamus itself based on the size of hypothalamus the child is born with. Neuroscientists have questioned “does its size determine homosexuality, or does homosexuality determine its size?” (Dallas). Yet, no one can be sure since the test was done on two deceased men. This being said, people can believe homosexuality is a gene that they are born with. This situation has aroused through this century as research rises concerning behaviors from the structures of the brain. In order to continue to convince the reader that people can be born homosexual and it is not a choice that they make as they grow. The article “Born Gay?” written by

In today’s day in age, different sexualities and gender identities are quickly becoming more accepted in mainstream society. Despite this change, there are many people who believe that having a different sexual orientation or gender identity is a choice that is frowned upon. In order to refute this belief, research and biology of the brain is necessary. Researching the brain on the basis of sexuality is a fairly new topic of discussion because it is somewhat difficult and confusing. This paper will explore the different identities of gender, sex and sexual orientation and the main biological reasons behind these. There is also some validity of different sexual orientations and identities through the evidence of sexual disorders like

The question of what causes some people to be sexually attracted to members of their own gender generates many different answers. In recent years, startling new research (Barinaga, 1993, p.17) has indicated that homosexuality is possibly inherited and determined by biological differences in Brain structure and genes. This study raises an interesting question: If homosexuality is hereditary, is there any basis for societal discrimination against something innate? If it is nature, it is good. If it is good, it should be accepted. A genetic component in sexual orientation would send a message to homosexuals and the society that homosexuality is not a fault, and not the fault of anyone other than nature. Gays and lesbians are born in nature, just like some people who are inherited left-handed gene from their parents.