Conjoined twins Conjoined twins or the once-commonly used term "siamese" are monozygotic twins whose bodies are joined together during pregnancy. Complications during pregnancy[ edit ] Main article: Unusual twinnings[ edit ] Among dizygotic twins, in rare cases, the eggs are fertilized at different times with two or more acts of sexual intercourse, either within one menstrual cycle superfecundation or, even more rarely, later on in the pregnancy superfetation. Stillbirths[ edit ] Stillbirths occurs when a fetus dies after 20 weeks of gestation. One foetus acts as a parasite towards the other. One study estimates that the frequency of heteropaternal superfecundation among dizygotic twins, whose parents were involved in paternity suits, was approximately 2. The number of cells derived from each fetus can vary from one part of the body to another, and often leads to characteristic mosaicism skin coloration in human chimeras.
This means that the molar zygote's cellular division continues unchecked, resulting in a cancerous growth that overtakes the viable fetus. One study estimates that the frequency of heteropaternal superfecundation among dizygotic twins, whose parents were involved in paternity suits, was approximately 2. Conjoined twins Conjoined twins or the once-commonly used term "siamese" are monozygotic twins whose bodies are joined together during pregnancy. The number of cells derived from each fetus can vary from one part of the body to another, and often leads to characteristic mosaicism skin coloration in human chimeras. Ectopic pregnancies must be resolved because they can be life-threatening to the mother. However, there are researchers and scientists that say cryptophasia or idioglossia is not a rare phenomenon. Typically, this results when one twin has either triploidy or complete paternal uniparental disomy , resulting in little or no fetus and a cancerous, overgrown placenta, resembling a bunch of grapes. This condition occurs in about 1 in 50, human pregnancies. This phenomenon is known as heteropaternal superfecundation. Miscarried twin[ edit ] Occasionally, a woman will suffer a miscarriage early in pregnancy, yet the pregnancy will continue; one twin was miscarried but the other was able to be carried to term. Twin-to-twin transfusion syndrome[ edit ] Main article: Twin-to-twin transfusion syndrome Monozygotic twins who share a placenta can develop twin-to-twin transfusion syndrome. Chimera genetics A chimera is an ordinary person or animal except that some of their parts actually came from their twin or from the mother. Dizygotic twins from biracial couples can sometimes be mixed twins , which exhibit differing ethnic and racial features. Both cloned ova are then fertilized by different sperm and the coalesced eggs undergo further cell duplications developing as a chimeric blastomere. There are several reasons for the "vanishing" fetus, including it being embodied or absorbed by the other fetus, placenta or the mother. Intrapartum death, which is more common, occurs when a baby dies while the mother is giving birth. One such pairing was born in Germany in to a white father from Germany and a black mother from Ghana. Caesareans or inductions are advised after 38 weeks of pregnancy for twins, because the risk of stillbirth increases after this time. There is no DNA-based zygosity test that can determine if twins are indeed mirror image. A female calf that is the twin of a bull becomes partially masculinized and is known as a freemartin. The lives of both twins are endangered by this condition. The cause of stillbirth is often unknown, but the rate of babies who are stillborn is higher in twins and multiple births. Current research is looking into the impacts of a richer social environment for these twins to stimulate their development of language. Complications during pregnancy[ edit ] Main article: Semi-identical twins[ edit ] Monozygotic twins can develop differently, due to different genes being activated. However, in most cases, the intrauterine pregnancy can be salvaged.
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