From the point of conception, human beings are made up of 46 chromosomes, 23 male and 23 female. After insemination, paternal and maternal chromosomes fuse, this fusion determines the sex of the child. The amalgamation of two X chromosomes creates a female child, while the combination of X and Y chromosomes, leads to the development of a male offspring. Each chromosome contains thousands genes and each gene contains specific information about how part of the body will be formed. Genes are responsible for almost every aspect of the human body, from hair colour to the development of our organs, organs like the brain and it is within the brain were the biggest changes take place when our bodies under go their sexual metamorphous, during sexual maturation. When we reach sexual maturity, we have our first insight into our sexuality, an insight which is genetically programmed into our consciousness through our DNA, this theory is supported by the work of hamer et al ( 1993) who conducted a study of male sexual orientation. "Hamer examined 40 pairs of gay brothers. He examined 22 genetic markers distributed across the X chromosome in order to see if brothers concordant for homosexuality, were also concordant for the markers. He found that the chromosomal region of xq28, at the tip of the long arm of the X chromosome, 33 of the 40 pairs of brothers shared all the markers. This was statistically different from the expected rate (20 out of 40) suggesting that the gene influencing male sexual orientation, lies within that chromosomal region" In this study, Hamer along with many other fellow geneticists, is claiming that he has found the gene which dictates our sexual orientation, therefore genes are a precursor to our sexuality and our sexuality is decided at an anatomical level in the womb. Whilst in the womb, it seems that our sexuality is being pre programmed by our genes but there are other biological developments taking place, namely the formation of our hormones, hormones which will lie dormant until the onset of puberty.
