People who say "homosexuality is genetically related" are delusional

I would first off like to make it clear as to what I, representing con, must do to win this debate. Pro is positing that there is no correlation between genetic makeup and homosexual tendencies. As such, I, con, must provide at the very least ONE unrefuted example of this sort of link. In order for pro to win however, they must convincingly refute every single correlation I demonstrate. I would further like to note that I am NOT suggesting that genetics is the only cause for homosexuality. It is one of many factors that cause an individual's sexual tendencies to form. This being said, I will now make my case for a tangible, provable link between genetics and homosexuality. Thank you. I would like to reiterate the fact that I am not suggesting that homosexuality's sole cause is an individual's genetic makeup, rather it is a combination of both social and biological factors that lead to the existence of this phenomenon. 1) Chromosome Linkage Studies Although I could delve into great detail about the many studies that have been done on chromosome linkage, I will for simplicities sake focus primarily on a study performed by The American Society of Human Genetics in 2012. 409 independent pairs of gay brothers were analyzed with over 400000 single nucleotide polymorphism markers. The data demonstrated significant similarities in the distil region xq28 alleles. Significant linkage was also found in the pericentromeric region of chromosome 8, overlapping with the works genetics Hamer and Hu, who had each previously conducted a similar experiment. They concluded, "our findings, taken in context with previous work, suggest that genetic variation in each of these regions contributes to development of the important psychological trait of male sexual orientation." This study, along with several others, provide a clear genetic correlation between xq28 and homosexuality. 2) Sexual Differentiation in Other Species To suggest that homosexuality is a strictly human-quality is as you incorrectly put it, "delusional". With that mind, I present the following: -The sexual differentiation of the fruit fly brain and behavior has been completely mapped out, providing a clear model for biological sexuality. - In the Korean Advanced Institute for Science and Technology, the sexual preference of female mice was altered by REMOVING A SINGLE GENE (FumC). These female mice exhibited masculine sexual behavior and attraction to other female mice. This quite clearly alone demonstrated a genetic link between homosexuality and genetics. - Homosexual behavior and attraction has been observed in the wild in over 1500 species. Animals from primates to mallard ducks to hook worms have done the same as humans. So unless you are suggesting these animals are actively deciding to be gay, then you must concede a genetic link here. 3) Epigenetics Studies An important link has been noted between the genetic makeup of a mother and homosexuality. Bockland et al (2005) reported that mothers with extreme skewing of chromosome x deactivation had 10-20% more gay sons, a number far passed statistically significant. As I close I would like to again remind the audience of the sheer weight of the evidence I have provided. Pro is suggesting that there is NO genetic correlation, so all I must prove is that some link or causal connection exists. Therefore the burden lies on pro to fully refute each piece of evidence I have provided, lest they lose the debate. With this in mind I urge you to vote con. Sources: Chromosome linkage studies: "Genome-wide linkage scan of male sexual orientation. A. R. Sanders, K. Dawood, G. Rieger, J. A. Badner, E. S. Gershon, R. S. Krishnappa, A. B. Kolundzija, S. Guo, G. W. Beecham, E. R. Martin, J.M. Bailey8, Abstract 1957T" Fruit fly sexuality mapping: "http://www.sciencedirect.com...; Homosexuality in female mice: "http://www.biomedcentral.com...; Homosexuality in other animals: "http://www.nhm.uio.no...; Epigenetics study: "Bocklandt S, Horvath S, Vilain E, Hamer DH (February 2006). "Extreme skewing of X chromosome inactivation in mothers of homosexual men""