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Sometimes one twin fetus will fail to develop completely and continue to cause problems for its surviving twin. One fetus acts as a parasite towards the other.

Sometimes the parasitic twin becomes an almost indistinguishable part of the other, and sometimes this needs to be treated medically. A very rare type of parasitic twinning is one where a single viable twin is endangered when the other zygote becomes cancerous, or molar.

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.

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 occurrence is similar to the vanishing twin syndrome, but typically occurs later, as the twin is not reabsorbed. It is very common for twins to be born at a low birth weight.

More than half of twins are born weighing less than 5. Premature birth and low birth weights, especially when under 3.

Monozygotic twins who share a placenta can develop twin-to-twin transfusion syndrome. This condition means that blood from one twin is being diverted into the other twin.

The lives of both twins are endangered by this condition. Stillbirths occurs when a fetus dies after 20 weeks of gestation.

There are two types of stillbirth, including intrauterine death and intrapartum death. Intrauterine death occurs when a baby dies during late pregnancy.

Intrapartum death, which is more common, occurs when a baby dies while the mother is giving birth. The cause of stillbirth is often unknown, but the rate of babies who are stillborn is higher in twins and multiple births.

Caesareans or inductions are advised after 38 weeks of pregnancy for twins, because the risk of stillbirth increases after this time.

For otherwise healthy twin pregnancies where both twins are head down a trial of vaginal delivery is recommended at between 37 and 38 weeks.

Twin studies are utilized in an attempt to determine how much of a particular trait is attributable to either genetics or environmental influence.

These studies compare monozygotic and dizygotic twins for medical , genetic , or psychological characteristics to try to isolate genetic influence from epigenetic and environmental influence.

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.

Classical twin studies are now being supplemented with molecular genetic studies which identify individual genes. 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.

This can lead to the possibility of a woman carrying fraternal twins with different fathers that is, half-siblings. This phenomenon is known as heteropaternal superfecundation.

One study estimates that the frequency of heteropaternal superfecundation among dizygotic twins, whose parents were involved in paternity suits, was approximately 2.

Dizygotic twins from biracial couples can sometimes be mixed twins , which exhibit differing ethnic and racial features. One such pairing was born in Germany in to a white father from Germany and a black mother from Ghana.

Heterotopic pregnancy is an exceedingly rare type of dizygotic twinning in which one twin implants in the uterus as normal and the other remains in the fallopian tube as an ectopic pregnancy.

Ectopic pregnancies must be resolved because they can be life-threatening to the mother. However, in most cases, the intrauterine pregnancy can be salvaged.

Among monozygotic twins, in extremely rare cases, twins have been born with different sexes one male, one female.

The probability of this is so small that multiples having different sexes is universally accepted as a sound basis for in utero clinical determination that the multiples are not monozygotic.

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.

This results in one normal male XY and one female with Turner syndrome 45,X. Monozygotic twins can develop differently, due to different genes being activated.

These "half-identical twins" are hypothesized to occur when an unfertilized egg cleaves into two identical attached ova, both of which are viable for fertilization.

Both cloned ova are then fertilized, by different sperm, and the coalesced eggs undergo further cell duplications developing as a chimeric blastomere.

If this blastomere then undergoes a twinning event, two embryos will be formed, with different paternal genes and identical maternal genes.

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.

Mirror image twins result when a fertilized egg splits later in the embryonic stage than normal timing, around day 9— This type of twinning could exhibit characteristics with reversed asymmetry, such as opposite dominant handedness, dental structure, or even organs situs inversus.

There is no DNA-based zygosity test that can determine if twins are indeed mirror image. There have been many studies highlighting the development of language in twins compared to single-born children.

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.

Another term to describe what some people call "twin talk" is cryptophasia where a language is developed by twins that only they can understand.

The increased focused communication between two twins may isolate them from the social environment surrounding them. Idioglossia has been found to be a rare occurrence and the attention of scientists has shifted away from this idea.

However, there are researchers and scientists that say cryptophasia or idioglossia is not a rare phenomenon. Current research is looking into the impacts of a richer social environment for these twins to stimulate their development of language.

Twins are common in many animal species, including cats , sheep , ferrets , giant pandas , dogs , deer , marmosets , tamarins , and elephants.

A female calf that is the twin of a bull becomes partially masculinized and is known as a freemartin. From Wikipedia, the free encyclopedia.

For other uses, see Twin disambiguation and Twins disambiguation. Populated places with highest incidence of multiple birth. Cummings "Human Heredity Principles and issues" p.

Keith; Emile Papierik; Donald M. Clues to fertility, a student discovers". Public Library of Science.

Unlike singleton gestation where identification of patients at risk for PTL is often difficult, every multiple gestation is at risk for PTL, so all patients can be managed as being at risk.

Archived from the original on 17 January Retrieved 15 March Stanford School of Medicine. Archived from the original on 15 February Drug bid to beat child ban".

Retrieved 11 November Washington State Twin Registry. Retrieved 24 July European Society of Human Reproduction and Embryology.

Twins form after embryo collapses". The Journal of Reproductive Medicine. Researchers believe the laboratory culture could be the cause" Press release.

Archived from the original on Journal of Medical Genetics. American Journal of Medical Genetics. What makes monozygotic twins similar? Journal of Mind and Behavior.

Evidence of Polar Body Twinning in Man". American Association for the Advancement of Science. Archived from the original PDF on In Robert Resnik; Robert K.

Principles and Practice 5th ed. Effect of diet and heredity on the human twinning rate". National Vital Statistics Reports.

National Center for Health Statistics. Acta Genet Med Gemellol Roma. Archived from the original on 25 January Archived from the original on 15 May Retrieved 23 October Archived from the original on 4 October Archived from the original on 27 April Br J Obstet Gynaecol.

New England Journal of Medicine. Acta Obstet Gynecol Scand. The excluded twin pregnancies were in cases of 1 delivery before 34 weeks of gestation; 2 when the first twin was delivered by caesarean section ; 3 when either of the twins had died in the womb before the onset of labor; and 4 when the pregnancy had been complicated by fetal malformations or Twin-to-twin transfusion syndrome.

Keith; Emile Papiernik; Donald M. Royal College of Obstetricians and Gynaecologist. Retrieved 12 June Twin Research and Human Genetics.

Twin-to-twin transfusion syndrome Twin reversed arterial perfusion Monoamniotic twins. Parasitic twin Craniopagus parasiticus Fetus in fetu.

Vanishing twin Chimerism Mixed twins. Retrieved from " https: Twin Reproduction in mammals Sibling Zoology. Views Read Edit View history. In other projects Wikimedia Commons Wikiquote.

This page was last edited on 28 January , at By using this site, you agree to the Terms of Use and Privacy Policy. Usage is practically equivalent with heteropaternal superfecundation , which occurs when two different males father fraternal twins, because though superfecundation by the same father is thought to be a common occurrence, it can only be proven to have occurred with multiple fathers.

A woman gets pregnant again while already pregnant, resulting in multiple fetuses at differing developmental stages.

Normally, twins have two separate di- being a numerical prefix for two chorions and amniotic sacs , termed Dichorionic-Diamniotic or "DiDi".

Dichorionic-Diamniotic twins form when splitting takes place by the third day after fertilization. Monochorionic twins share the same placenta.

Since , more than 1 million bicycles were produced in Portugal. They also sell bike accessories and parts for budget prices. From Wikipedia, the free encyclopedia.

This article has multiple issues. Please help improve it or discuss these issues on the talk page. Learn how and when to remove these template messages.

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