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. Sometimes the parasitic twin becomes an almost indistinguishable part of the other, and sometimes this needs to be treated medically. Another abnormality that can result in monozygotic twins of different sexes is if the egg is fertilized by a male sperm but during cell division only the X chromosome is duplicated. 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. Caesareans or inductions are advised after 38 weeks of pregnancy for twins, because the risk of stillbirth increases after this time. Cells in each fetus carry genes from either sperm, resulting in chimeras. This form had been speculated until only recently being recorded in western medicine. A chimera may be intersex , composed of cells from a male twin and a female twin. Twins that have been separated early in life and raised in separate households are especially sought-after for these studies, which have been used widely in the exploration of human nature.
This occurs when the zygote starts to split after day 12  following fertilization and fails to separate completely. Ectopic pregnancies must be resolved because they can be life-threatening to the mother. Classical twin studies are now being supplemented with molecular genetic studies which identify individual genes. Complications during pregnancy[ edit ] Main article: Low birth weight[ edit ] It is very common for twins to be born at a low birth weight. Cells in each fetus carry genes from either sperm, resulting in chimeras. Conjoined twins Conjoined twins or the once-commonly used term "siamese" are monozygotic twins whose bodies are joined together during pregnancy. This condition occurs in about 1 in 50, human pregnancies. They would go on to have an astounding 21 children between them. Twins that have been separated early in life and raised in separate households are especially sought-after for these studies, which have been used widely in the exploration of human nature. Caesareans or inductions are advised after 38 weeks of pregnancy for twins, because the risk of stillbirth increases after this time. After a decade on the sideshow circuit, having saved some money, they retired, bought land in North Carolina, and set out to create lives for themselves as proper Southern gentlemen. This means that the molar zygote's cellular division continues unchecked, resulting in a cancerous growth that overtakes the viable fetus. They bought property, became US citizens, and even took on slaves — ironic, considering that throughout their early lives here, many questioned whether, despite their firm denials, they were slaves themselves. Both cloned ova are then fertilized by different sperm and the coalesced eggs undergo further cell duplications developing as a chimeric blastomere. These studies have converged on the notion that there is a greater rate of delay in language development in twins compared to their single-born counterparts. This is known as vanishing twin syndrome. Twin study Twin studies are utilized in an attempt to determine how much of a particular trait is attributable to either genetics or environmental influence. This phenomenon is known as heteropaternal superfecundation. A female calf that is the twin of a bull becomes partially masculinized and is known as a freemartin. A chimera may arise either from monozygotic twin fetuses where it would be impossible to detect , or from dizygotic fetuses, which can be identified by chromosomal comparisons from various parts of the body. However, in most cases, the intrauterine pregnancy can be salvaged. 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. This results in one normal male XY and one female with Turner syndrome 45,X. Premature birth and low birth weights, especially when under 3.
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