Two sperm fertilize one egg

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Doctors have documented what they say is only the world's second known case of "semi-identical" twins. The boy and the girl, now four, from Brisbane, in Australia, are identical on their mother's side. But they share only a proportion of their father's DNA - placing them, genetically, somewhere between fraternal and identical twins. Prof Nicholas Fisk, who led the team that cared for the mother and twins at the Royal Brisbane and Women's Hospital in , said the discovery was made through a routine pregnancy scan. Identical, or monozygotic, twins occur when a single egg, fertilised by a single sperm, divides and makes two babies.
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One egg, two sperm create rare semi‑identical twins

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‘Semi-identical’ twins born from 1 egg and 2 sperm - National | musicarmenie.com

By Gene Emery. The only other reported case was uncovered in Virtually all twins are either fraternal where two eggs and two sperm have created two separate embryos or identical where one embryo splits in two before resuming normal development for each child. Because an ultrasound taken early in the pregnancy showed that both fetuses shared the same placenta, doctors assumed the fetuses were identical twins. But when an ultrasound eight weeks later revealed that one child was male and the other female, something considered impossible for identical twins, the Gabbett team knew something extraordinary had happened. The researchers say it appears that after fertilization, the DNA from the egg and two sperm divided, then got divvied up to create three embryos. The remaining embryo, with only sperm DNA, was not viable.
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Semi-identical twins 'identified for only the second time'

Want to discuss? Please read our Commenting Policy first. The only other reported case was uncovered in Virtually all twins are either fraternal where two eggs and two sperm have created two separate embryos or identical where one embryo splits in two before resuming normal development for each child.
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This page has been archived and is no longer updated. Published online 26 March Nature doi John Whitfield. Researchers have discovered a pair of twins who are identical through their mother's side, but share only half their genes on their father's side.
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