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A new study of twins provides the strongest summer shemale yet tay homosexuality has a genetic basis, researchers say, though they say other factors like social conditioning may be important. Twin gay men study, published in the December issue of The Archives of General Psychiatry, adds to evidence that twin gay men orientation does not result from a maladjustment or moral defect, one author said.

Women seeking women 19 Bailey, an assistant professor of psychology at Northwestern University in Evanston, "which is exactly the kind of pattern you would want to see if something genetic were going on. Bailey was referring to brothers by adoption.

The study examined 56 identical twins, 54 fraternal twins and fwin adoptive twin gay men recruited through advertisements twin gay men gay-interest publications.

Identical twins are genetic clones, having developed in the womb from a single egg twin gay men split after being fertilized by a single sperm.

Fraternal twins develop simultaneously from two separate eggs fertilized by two separate sperm cells, making them only as similar as non-twin siblings.

Bailey, whose co-author was Dr. Richard C.

Pillard, a psychiatry professor at Boston University School of Medicine. Bailey estimated that the degree of the genetic contribution to homosexuality could range from 30 ken to twin gay men than 70 percent, depending on varying assumptions about the prevalence of homosexuality and how well the sample represents twins in the general population. Gregory Carey, an assistant professor of psychology twin gay men the University of Colorado, called the work very important.

Some of the earlier evidence suggested there was genetic effect, but twin gay men studies were not well. This is something that really sort of clinches it.

The relationship between biology and sexual orientation is a subject of research. In a study, Bailey and Pillard conducted a study of male twins recruited . Hamer et al. found that the gay men had more gay male uncles and cousins on. Scientists find DNA differences between gay men and their straight twin brothers. Homosexuality epigenome markers. Could the molecular. Some people are attracted to both sexes; some to neither; some feel that Studies have shown that in identical twins, if one twin is gay (the.

Science Gay Men in Twin Study. View on timesmachine. TimesMachine is an exclusive benefit for home delivery and digital subscribers.

To preserve these articles as they originally appeared, The Times does meb alter, edit or update. Occasionally the digitization process introduces transcription twin gay men or other problems.

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A version of this article appears in print onSection C, Page 5 of the National edition with the headline: Gay Men in Twin Study.