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Rare "semi-identical" twins found during an Australian woman's pregnancy



A rare set of semi-identical twins ̵

1; only the second set ever reported in the world – was discovered in Australia.

A 4 year old boy and girl from Brisbane share all their mother's DNA, but only part of their father's DNA that makes them identical on their mother's side, but fraternal according to their father, statements detailing this discovery.

This was also the first case where semi-identical twins were discovered during pregnancy, according to the case

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t United States in 2007 .

"It's likely that the mother's egg was fertilized at the same time with two sperms of the father before divorce," said Nicolas Fisk, professor at the University of New South Wales in Australia. strengthening. Fisk is a fetal medicine specialist who led the fetal medicine group, who cared for mothers and twins, and worked with a clinical geneticist and chief researcher, Dr. Michael Gabbeth. Three sets of chromosomes are "one set from the mother and two from his father," Dr. Gabbeth explained.

"Three sets of chromosomes are usually incompatible with life, and embryos usually do not survive," he added. "In the case of a session of the bisexual twins of Brisbane, the fertilized egg divides the three groups of chromosomes into groups of cells, which then split into two parts, creating twins." "/>

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Doctors picked up semi-identical twins during normal mother's ultrasounds, her six-week ultrasound showed she expects identical twins, but a 14-week scan "showed that the twins were male and female, which is impossible for identical twins," said Fisk.

28-year-old woman was

To make sure that there were no other semi-identical twins that had not previously been identified, doctors surveyed genetic data from 968 brotherly twins "We know that this is an exceptional case of semi-identical twins," Fisk said. "Although doctors may have this in mind, it's likely that identical twins , its rarity means that there is no case for routine genetic testing. "


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