The relationship between biology and sexual orientation is a subject of research. While scientists do not know the exact cause of sexual orientation , they theorize...
An overview of human handedness in twins
Left-handedness always occurs at a lower frequency than right-handedness. Generally, left-handedness is found within The reasons for this have long been debated. Although there are many theories, such as cerebral symmetry, the reason has not been conclusively proven. There is no difference in the handedness frequency between MZ and DZ twins. If both parents are left handed, it is almost certain one will be left handed. This is the same for both DZ and MZ.
Cross-dominance is when your dominant eye and dominant hand are different and if one twin is both right-handed and right-eyed, they have most likely been forced to use their non-dominant hand by a school teacher or parent. An early twinning event which happens before 4 days post-fertilization causes monozygotic dichorionic MZDC twins.
MZDC twins are born in two different chorion sacs. A later twinning event which occurs after 4 days postfertilization causes monozygotic monochorionic MZMC twins. MZMC twins are born in the same chorionic membrane. It is believed that this correlation between handedness in twins mirror imaging is due to MZ twins sharing the same placental blood supply, and being surrounded by the same chorionic membrane.
identical twin studies prove homesexuality is not genetic - Local Dating
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- LEFT-HANDEDNESS ALWAYS OCCURS AT A LOWER FREQUENCY THAN RIGHT-HANDEDNESS. GENERALLY IT IS BELIEVED THAT THIS CORRELATION...
Situs inversus, asymmetry and twinning. This was popularly dubbed the " gay gene " in the media, causing significant controversy. The second group comprised 16 men whose sexual orientation was unknown, but whom the researchers presumed to be heterosexual. Although wide confidence intervals suggest cautious interpretation, the results are consistent with moderate, primarily genetic, familial effects, and moderate to large effects of the nonshared environment social and biological on same-sex sexual behavior.
Eight sets of MZ twins were examined, and no evidence was found to support the influence of pathogenic congenital factors on handedness.
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