The "Wrong way" wong778 aka MrSpike2 ZOT guy ZOTTED again: Why do left handed people choose left han

Biological Asymmetry and Handedness ^ | 1991 | I.C. McManus

[logcabinrep]

	Human Handedness	Human Sexual Orientation
Distribution [1]	Stable bimodalism, behaviorally expressed	Stable bimodalism, behaviorally expressed
Population distribution:	Majority and Minority orientations Majority orientation: 92% Minority orientation: 8%	Majority and Minority orientations Majority orientation: 95% Minority orientation: 5%
Population distribution of orientations according to sex:	Male: 9% Female: 7%	Male: 6% Female: 3%
Male : Female ratio for minority orientations	1.3 : 1 Minority orinetation 30% higher in men than women	2 :1 Minority orientation 100% higher in men than women
Does minority orientation coorelate with race? geography? culture? [2] Mental or physical pathology? [3]	No No No No	No No No No
Age of first behavioral appearance of trait:	around age 2	around age 2
Is either orientation chosen?	No	No
Is either orientation pathological?	No	No
Can external expression be altered?	Yes	Yes
Can interior orientation be altered clinically?	No	No
Is trait familial/does trait run in families?	Yes	Yes
Pattern of familiality:	"Maternal effect" implies X-chromosome linkage.	"Maternal effect" implies X-chromosome linkage. [4]
Parent-to-child segregation?[5]	Little to none. Handedness of adopted (i.e. non-biological) children shows no relationship to that of adoptive parents, indicating a genetic influence.	Little to none. Sexual orientation of adopted (i.e. non-biological) children shows no relationship to that of adoptive parents, indicating a genetic influence.
Do siblings of those with minority orientation have increased rates of minority orientation?	Yes. Elevated rate of left-handedness in families with other left-handed children.	Yes. Elevated rate of homosexuality in families with other homosexual children.
Are monozygotic (identical) twins more likely to share minority orientation?	Yes	Yes
MZ concordance for minority orientation [6] (vs. background rate):	12% (vs. 8%, so MZ rate is 1.5 times higher)	50% (vs. 5%, so MZ rate is 10 times higher)

From: A Separate Creation: The Search for the Biological Origins of Sexual Orientation

Sources: I.C. McManus, "The Inheritance of Left-Handedness," Biological Asymmetry and Handedness, Ciba Foundation Symposium 162. (Chichester) John Wiley & Sons: 1991, 251-267; J. Michael Bailey and Richard Pillard, "A Genetic Study of Male Sexual Orientation," Archives of General Psychiatry 48 (December 1991): 1089-1096; Dean Hamer et al., "A Linkage Between DNA Markers on the X Chromosome and Male Sexual Orientation," Science 261 (July 16, 1993): 321-327 [return to top]

¹Both traits show a very small number of humans are ambioriented. Handedness shows almost none for both men and women--McManus: "Measures of handedness usually show a bimodal distribution with few subjects appearing truly ambidextrous." Sexual orientation, likewise, shows almost none for men but a still small though significant number for women. [return to footnote 1]

²However, may highly influence expression. [return to footnote 2]

³There is currently fierce debate over the existence of a correlation between left-handedness and certain pathologies, most notably schizophrenia. Some researchers assert that handedness, thought to reflect one aspect of brain lateralization, may be a result of a cause--in some manner a concomitant--of schizophrenia's etiology or pathophysiology. A study done by Charles Boklage ("Schizophrenia, brain asymmetry deveopment, and twinning," Biol. Psychiatry 12, 19-35, 1997) powerfully developed the hypothesis, and Nancy Segal ("Origins and implications of handedness and relative birth weight for IQ in monozygotic pairs," Neuropsychology 27, 549-561, 1989) also supports some form of correlation. On the other hand, Luchins et al. (1980) and Lewis et al. (1989), in their respective replication attempts of Boklage's work, found little support, and Gottesman et al. ("Handedness in twins with schizophrenia: was Boklage correct?" Schizophrenia Research 9, 83-85, 1993) conclude that there does not appear to be an association between handedness and schizophrenia. (See Gottesman for a more complete bibliography.) The point, however, is the distinct difference between the trait profile of handedness and that of sexual orientation: while there is clinical debate in scientific and research circles over whether handedness correlates in some way with psychobiological abnormalities, no such debate exists regarding sexual orientation, and neither heterosexuality nor homosexuality are implicated in any mental or physical pathology. [return to footnote 3]

⁴A subset of gay men show the maternal effect. It does not appear in women. [return to footnote 4]

⁵"Segregation" is a genetic term of art meaning the way the trait shows up in individuals down through generations. [return to footnote 5]

⁶Indicates that genetics play a significantly greater role in sexual orientation than in handedness. [return to footnote 6]

[bonesmccoy]

Is that the best you can do?

Homosexuality is an adult behavior pattern.

There is no question that male toddlers and female toddlers understand their social roles.

I am a board certified doctor and I routinely screen children for school readiness.

Part of our screening test is to ask children what sex they are. There is no question that a 3 year old knows what sex they are.

How come 30 year old adults can't figure it out?

Did they lose something during childhood or adolescence?

I'd say yes. The homosexual community lost a sense of reality due to abuse from a parent or another individual.

If homosexual orientation were genetically determined, there would be a real marker involved. This marker would exist in identical twins. Unfortunately, the only twin study that looked at adopted twins reared in separate environments indicates that homosexuality is not a genetic characteristic.

Homosexuality is a learned behavior.

[ladyinred]

I agree with you 100% doc!

[bonesmccoy]

Is it just me, or does it escape the befuddled gay activists that 4 year old children can answer the question: "ARE YOU A BOY OR GIRL?" clearly.

But, there are 60 year old ex-hippie, toga-wearing, pot smoking, deadheads who can't?

[Devil_Anse]

If homosexuals had known the sweeping Americans With Disabilities Act was coming down the pike, I wonder if they would have been so eager to have their attraction to persons of their same gender removed from the official list of psychiatric illnesses. They have missed out on a lot of freebies.

[Jackie-O]

logcabinrep-R.I.P.

[Devil_Anse]

Oh, no! R.I.P.?? I hope he lived in Vermont, 'cause then at least he had the same right as heteros, to leave his property to his partner... Oh. Wait. He DID have the right to leave his property to his partner--it's called a WILL, available to both heterosexuals and homosexuals. No new laws required. How 'bout that.