Sexual orientation, handedness, sex ratio and fetomaternal tolerance-rejection

Fraternal birth order (FBO) appears as a prenatal cause of 15% of homosexual males (gays) through mnemonic maternal anti-male factors. Non-right-handed men seem to be protected from homosexuality. Four hypotheses are proposed: (1) androgenic factors of non-right-handedness neutralize anti-male facto...

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Autor principal:	Valenzuela,Carlos Y
Lenguaje:	English
Publicado:	Sociedad de Biología de Chile 2010
Materias:	homosexuality handedness sex ratio birth order fetomoternal tolerance genetic distortions
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602010000300012
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spelling	oai:scielo:S0716-976020100003000122010-11-30Sexual orientation, handedness, sex ratio and fetomaternal tolerance-rejectionValenzuela,Carlos Y homosexuality handedness sex ratio birth order fetomoternal tolerance genetic distortions Fraternal birth order (FBO) appears as a prenatal cause of 15% of homosexual males (gays) through mnemonic maternal anti-male factors. Non-right-handed men seem to be protected from homosexuality. Four hypotheses are proposed: (1) androgenic factors of non-right-handedness neutralize anti-male factors; (2) non-right-handedness and homosexuality are lethal or produce mental impairment; (3) non-right-handed male embryos are insensitive to anti-male factors; (4) mothers of non-right-handed fetuses do not produce anti-male factors. Studies of the sex ratio (SR) of older and younger siblings show: (1) a significant heterogeneity in the SR of siblings of right or non-right handed heterosexual men and women; (2) lesbians are born among siblings with high SR; (3) siblings of right-handed gays show a higher SR than non-right-handed gays that present a low SR. Based on our discovery of maternal tolerance-rejection processes, associated with genetic systems (ABO, Rh), where zygotes or embryos different from their mother induce better pregnancy and maternal tolerance than do those that share antigens with their mothers, I propose a new explanation for sexual relationships, sexual orientation, handedness and sibling SR. Lesbian embryos could induce tolerance from mothers with anti-female factors. Non-right-handedness could induce maternal tolerance, or change the maternal compatibility of "gay" embryos. Alternatively, gay embryos could be poor inducers of maternal tolerance towards male traits.info:eu-repo/semantics/openAccessSociedad de Biología de ChileBiological Research v.43 n.3 20102010-01-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602010000300012en10.4067/S0716-97602010000300012
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	homosexuality handedness sex ratio birth order fetomoternal tolerance genetic distortions
spellingShingle	homosexuality handedness sex ratio birth order fetomoternal tolerance genetic distortions Valenzuela,Carlos Y Sexual orientation, handedness, sex ratio and fetomaternal tolerance-rejection
description	Fraternal birth order (FBO) appears as a prenatal cause of 15% of homosexual males (gays) through mnemonic maternal anti-male factors. Non-right-handed men seem to be protected from homosexuality. Four hypotheses are proposed: (1) androgenic factors of non-right-handedness neutralize anti-male factors; (2) non-right-handedness and homosexuality are lethal or produce mental impairment; (3) non-right-handed male embryos are insensitive to anti-male factors; (4) mothers of non-right-handed fetuses do not produce anti-male factors. Studies of the sex ratio (SR) of older and younger siblings show: (1) a significant heterogeneity in the SR of siblings of right or non-right handed heterosexual men and women; (2) lesbians are born among siblings with high SR; (3) siblings of right-handed gays show a higher SR than non-right-handed gays that present a low SR. Based on our discovery of maternal tolerance-rejection processes, associated with genetic systems (ABO, Rh), where zygotes or embryos different from their mother induce better pregnancy and maternal tolerance than do those that share antigens with their mothers, I propose a new explanation for sexual relationships, sexual orientation, handedness and sibling SR. Lesbian embryos could induce tolerance from mothers with anti-female factors. Non-right-handedness could induce maternal tolerance, or change the maternal compatibility of "gay" embryos. Alternatively, gay embryos could be poor inducers of maternal tolerance towards male traits.
author	Valenzuela,Carlos Y
author_facet	Valenzuela,Carlos Y
author_sort	Valenzuela,Carlos Y
title	Sexual orientation, handedness, sex ratio and fetomaternal tolerance-rejection
title_short	Sexual orientation, handedness, sex ratio and fetomaternal tolerance-rejection
title_full	Sexual orientation, handedness, sex ratio and fetomaternal tolerance-rejection
title_fullStr	Sexual orientation, handedness, sex ratio and fetomaternal tolerance-rejection
title_full_unstemmed	Sexual orientation, handedness, sex ratio and fetomaternal tolerance-rejection
title_sort	sexual orientation, handedness, sex ratio and fetomaternal tolerance-rejection
publisher	Sociedad de Biología de Chile
publishDate	2010
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602010000300012
work_keys_str_mv	AT valenzuelacarlosy sexualorientationhandednesssexratioandfetomaternaltolerancerejection
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Sexual orientation, handedness, sex ratio and fetomaternal tolerance-rejection

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