The four-year-old brother and sister are identical on the mother’s side and fraternal twins on the father’s side.
An extremely rare set of semi-identical twins has been identified in Australia—becoming only the second ever confirmed.
A Third Type of TwinIn the case of identical —known as monozygotic—twins, a single sperm fertilizes an egg, which then divides into two, producing babies that share the same DNA. In fraternal, or dizygotic, twins, two different eggs are fertilized by two different sperm. With semi-identical twins, an egg is fertilized by two sperm, forming a triploid, which then splits in two.
The latest set of semi-identical twins was found because of an unusual ultrasound—at six weeks, the scan showed a single placenta and amniotic sacs that indicated she was expecting identical twins. However, eight weeks later an ultrasound showed the twins were male and female, which is impossible for identical twins.
Michael Gabbett, a clinical geneticist also involved in the case, added:"The fertilized egg appears to have equally divided up the three sets of chromosomes into groups of cells that then split into two, creating the twins. Some of the cells contain the chromosomes from the first sperm while the remaining cells contain chromosomes from the second sperm, resulting in the twins sharing only a proportion rather 100 percent of the same paternal DNA.
France Dernières Nouvelles, France Actualités
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