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Fraternal or dizygotic twins occur when two eggs are released from the ovaries and This important sex hormone plays a vital role in stimulating the ovaries to Most twins are non identical twins; around two out of every three sets of twins fit .

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Homosexual orientation in twins: a report on 61 pairs and three triplet sets. - PubMed - NCBI

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Description:Conjoined twins Conjoined twins or the once-commonly used term "siamese" are monozygotic twins whose bodies are joined together during pregnancy. Gender in Island Southeast Asia. Stillbirths[ edit ] Stillbirths occurs when a fetus dies after 20 weeks of gestation. How many pregnancies a woman has had previously is a factor in her conceiving with twins. Semi-identical twins[ edit ] Monozygotic twins can develop differently, due to different genes being activated. Twin-to-twin transfusion syndrome Monozygotic twins who share a placenta can develop twin-to-twin transfusion syndrome.

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