A couple of Australian brothers and sisters are some strangers who have never been documented, according to their doctors. The twin brothers and sisters say they are semi-identical, because they share the exact DNA of their mother's side, but only a part of their father's genetic makeup. Twins have found semi-identical children, and it is only the first case to be identified during pregnancy.
Twins's story was published in a report published in the New England Journal of Medicine. The authors say, siblings are sesquizygotic twin classes, between twin twins and identical.
The twin pairs occur when two sperm cells fertilize two eggs, which produce two different zygotes when both end up ending as embryos that develop in the uterus. So genetically similar (approximately 50 percent), would be like any two brothers and sisters: they were born at the same time. When two identical twins do the same semantics that do the same egg, then the zygote is divided into two embryos, each sharing the same DNA genetic mix with the mother and father.
But in this case, the authors theorize, both sperm infused the same egg at the same time. However, this type of defect can be rapidly caused in an abortion, since humans do not usually develop in three different chromosomes. Somehow, however, it was concluded that the cycles added the same separation of the three sets of DNA, which later formed three cell groups: cells between mother DNA and DNA 1 sperm; cells from mother DNA and sperm DNA 2; and cells with DNA from 1 to 2 sperm. Over time, the third group of single sperm was effective in both parents with DNA cells. Later, even more unexpectedly, they divided two emulsions into a series of cells, creating twins.
"Near the mother, they are 100 percent equal and 78 percent are equal to their father, so that the average is equal to 89 percent," said Michael Gabbett, the author of the genetics of Queensland University of Technology, said Gizmodo.
Gabbett and his teammate. Nicholas Fisk, a rectorate and vice-rector of the University of New South Wales, has managed Fetal Care in Queensland's Royal Brisbane and Women's Hospital in 2014. Mother's twin weeks of pregnancy did not seem to have been unusual in the second quarter.
"In the six weeks of the mother, the ultrasound showed a single placenta and amniotic bag positioning, indicating that the twins were the same," said Fisk in a statement. "However, in the 14 weeks, the ultrasounds were twin men and women, the twins were not the same".
"100 percent are equal to the mother and 78 percent are equal to the father, so the average is equal to 89 percent."
Fiskek and his team also had half-identical twins with excellent medical literature and database twins. But they only got one other instance. In this case, In 2007, it was published by doctors of the United States, emphasizing the complexity of biological sex.
United States doctors indicated that dividing paternity chromosomes were intersexual creatures, with ambiguous genitalia; the other was anatomically male. Y chromosomes usually determines the sex of people with biological men, mainly in cells with XY chromosomes. When the two twin XY and XX sex chromosomes were mixed, but intersexual twentieth. It had a division of the XY of the 20th century; An anatomically twin male split 50-50. The participation of twin male twin genes in the male victim was not enough to develop male sexual organs.
"We initially questioned whether other cases were classified as wrongdoing or not, we analyzed genetic data from 968 twin brothers and their parents," said Fisk. "However, we have not found these data in the other two videos, or the twin ones, the twins in the main general analyzes."
Australian twins are chemicals next to their father, a twin XY and a XX sex chromosome roughly divided into 50-50 parts, while the other is XX and XX. Unlike the case of 2007, however, the twins are anatomically male and female, respectively. Unfortunately, the twin females did not associate a blood clot soon after birth, with the need for an arm's arm's amputation. Likewise, it was diagnosed with gonadal dysgenation, the creative conditions associated with rare chromosome configurations. The disorder causes a person's genitalia not to develop normally and becomes a cancer, the twin has received a preventive surgical removal of its ovules.
However, two twins, now 4 years old, are typically developing and doing very well, Gabbett said Gizmodo. The plan for planning further complications for himself and his team for monitoring twins.