Well, in Fundamental Judaism (Ultra-Orthodoxy) you don't have a soul until you draw breath. Thus you aren't technically a full human being until you emerge from the womb
and draw your first breath. Therefore, abortion is Halachically (Jewish Law) Legal. In fact, some Rabbis would argue that if the parents knew of a genetic condition before the child is born, it would be the duty of the parents to terminate pregnancy rather than put a soul through the trials and tribulations of living with a genetic defect. This principal is sometimes used in screening for
Tay-Sachs Disease in the Ashkhenazi Community (Eastern European Jewish).
I'm not sure what Halacha would have to say about knowingly birthing a homosexual man if one could test for a gene. Homosexual women don't count because a prohibition against female homosexuality isn't mentioned anywhere in Torah.
Anyway, also there are several camps concerning male homosexuality and Halacha. Some say that the Torah prohibition is about sex for sex's sake alone between men and not the bonded relationships that gay men have today. Some say that the Torah prohibition is about Canaanite homosexual temple prostitution where a man would take on the "female" role in a fertility right. There are other injuctions against men posing as women in the Torah. And some would say that the Torah prohibits male homosexuality altogether. Then there are the Ultra Orthodox who don't believe that male homosexuality is forbidden at all (they are in the minority).