6年前，美国国家癌症研究所（NCI）的分子遗传学家迪安·哈默（DeanHamer）和他的同事声称他们发现了男性同性恋的遗传线索。他们说，其工作表明了X染色体上的一种尚未辨明的基因影响了那些有此特性的人。研究人员为能知晓性取向的生物学基础而激动，但他们仍十分谨慎。因为其 Six years ago, molecular geneticist Dean Hamer of the National Cancer Institute (NCI) and his colleagues claimed they had uncovered the genetic cues for gay men. They say their work shows that an unidentified gene on the X chromosome affects those who have this trait. Researchers are excited about knowing the biological basis of sexual orientation, but they are still cautious. Because of it