Mmastodon ScienceBiology first seen 2 d ago, last 49 min ago, peak #7
Sesquizygotic twins: the rare 'semi-identical' siblings
Original: 🧬 Sesquizygotic twins are real, the "1.5 identical" kind. One egg was fertilized by two sperm, then split into two peopl
Sesquizygotic twins, sometimes described as '1.5 identical', occur when a single egg is fertilized by two sperm and then splits, producing siblings who are identical on their mother's side and share roughly 78% of their father's DNA. Only two confirmed cases are known: one in the United States in 2007 and one in Australia in 2019, detected during pregnancy.
Why now: The extreme rarity of this phenomenon, with only two confirmed cases worldwide, makes it a fascinating topic of discussion.
sesquizygotic twinsUnited StatesAustralia
Evidence
- 🧬 Sesquizygotic twins are real, the "1.5 identical" kind. One egg was fertilized by two sperm, then split into two people. Identical on the mom's side, about 78% shared on the dad's. Only two confirmed cases: US 2007, and Australia 2019, spotted in the womb. Rare enough that a… · jcrabapple@dmv.community · 8
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