Author: Miss Cellania / Source: Neatorama
In 2014, doctors caring for a pregnant women in Australia noticed that the twins she was carrying shared a single placenta, which indicates identical twins- twins formed when a fertilized egg splits in two. But tests also showed they were a boy and a girl, which means fraternal twins- formed from two different fertilized eggs.
They are a third type of twin, called sesquizygotic, meaning half-identical. They are identical on their mother’s side and fraternal on their father’s side.…in this case, the authors theorize, two sperm cells simultaneously fertilized the same egg. Ordinarily, that sort of mistake quickly results in a miscarriage, since humans usually can’t develop with three different sets…
The post Semi-Identical Twins appeared first on FeedBox.