a large study of gay brothers adds to evidence of being homosexual,but the results aren't strong enough to prove it . researchers who led the new study of nearly 800 gay brothers say their results previous evidence pointing to genes on the x chromosome " is not proof but it's a pretty good indication " on the two chromosomes have influence over sexual orientation. said Dr alan sanders, the lead author. neil risch, a genetics expert at the University of california, involved in smaller study that no link between male homosexuality and chromosome X. Dr robert Green, a medical geneticist at Harvard medical school,called the new study "intriguing but not in any way conclusive" the work was published by the journal psychological medicine. the national Institutes of health paid for the research.
study participant Dr chad Zawitz,a chicago physician, Being gay "is sort of like having certain eye colour or skin colour it's just who you are